Sodium Thiosulfate And Hydrochloric Acid Temperature

10 mL of 10% sulfuric acid solution and 2 g of KI. sulphur is produced. The balanced equation for this reaction is shown below. Fill a 25 ml buret with the 0. Clean test tube out and add 5mL of Hydrochloric acid to the test tube, place test tube in beaker. Hydrochloric acid (20% concentration) Sodium thiosulfate (developing fluids) chemical concentration, temperature, and length of exposure to chemicals. Add the correct volume of sodium hydroxide from the burette. The reaction between sodium thiosulphate(Na2S2O3) and hydrochloric acid (HCl) is usually the reaction chosen by most teachers to explain to their students the concept of kinetics and reaction rate. The reaction between sodium thiosulfate and acid is one such reaction and is mentioned in almost all textbooks. time how long it take for the cross to disappear when viewed from above i. Sodium Thiosulfate or Sodium Thiosulphate occurs as large, colorless crystals or as a coarse, crystalline powder. Adding soda ash (sodium carbonate) to increase pH. Sodium Thiosulphate and Hydrochloric Acid Essay Sample Sodium thiosulfate experiment essay. Add some cold water to your hot water beaker to bring the temperature down to 60*C. predict that as the concentration of sodium thiosulphate decreases,The reaction time will increase. Introduction. fnd04: chemistry lab report 168406 an experiment to determine the effect of temperature on rate of reaction between sodium thiosulfate and hydrochloric acid 2 Million more documents Students from all over the world have shared more than 2 million documents on StuDocu.



It is deliquescent in moist air and effloresces in dry air at a temperature above 33°. Stack Exchange network consists of 176 Q&A communities including Stack Overflow, the largest, most trusted online community for developers to learn, share their knowledge, and build their careers. The solid is an efflorescent (loses water readily) crystalline substance that dissolves well in water. Fill the three labeled pipets from the reaction plate. The thiosulfate ion decomposes in an acid solution producing colloidal sulfur: S2O32-(aq) + 2 H+ (aq) ( S(s) + SO2 + H2O(l) The times measured are those required to produce the same degree of turbidity produced by the formation of colloidal sulfur. The time taken for this to achieve a given cloudiness provides a way to measure the reaction time. 5 g of reagent Na 2 S 2 O 3. After adding thereto 2 parts by weight of sodium thiosulfate pentahydrate, and incubated the resulting aqueous solution to 60 ~ 70 ° C. • Factors affecting the reaction of thiosulfate solution and hydrochloric acid • thiosulfate solution and hydrochloric acid • flask • stop watch (optional) • Factors affecting the rate of the reaction involving a coloured substance (either being consumed or produced) such as the propanone and iodine reaction • propanone. Sodium thiosulfate reacts with hydrochloric acid, decomposing to sulfur and sulfur dioxide: Na 2 S 2 O 3 + 2HCl → 2NaCl + S + SO 2 + H 2 O. * Heat a water bath up to 25 C. Sodium chloride Formula - Sodium chloride Uses, Properties, Structure and Formula. For many reactions, an increase in temperature of just 10 °C will roughly double the rate of reaction. The thiosulfate anion is tetrahedral in shape and is notionally derived by replacing one of the oxygen atoms by a sulfur atom in a sulfate anion. FlinnScientific 235,550 views. Persistence and degradability Sodium Thiosulfate, 0. 15) Ignore anomalous results and do extra repeats to compensate.



Lesmahagow High School Page 6 7. The balanced equation for the reaction between ascorbic acid and sodium hydroxide is shown below: HC 6H7O6 (aq) + NaOH (aq) → H 2O (l) + NaC6H7O6 (aq) You will titrate each Vitamin C sample with the standardized NaOH solution to determine the mg of ascorbic acid present in each sample. Na 2 S 2O 3 (aq) + 2H Cl (aq) ˜ SO 2(aq) + S (s) + H 2 O (l) + 2Na Cl (aq) The sulphur will be deposited in the solution and causes the solution to become opaque. For example, adding hydrochloric acid to sodium thiosulfate solution starts a reaction which causes turns the solution cloudy. Persistence and degradability Sodium Thiosulfate, 0. Draw a cross on the bottom using marker pen 4. Hydrochloric Acid Nitric Acid Temperature Controllers, Thermostats Sodium Thiosulfate Reagent Grade 99%. Overview of the Experiment 1. React the sodium bicarbonate or sodium carbonate with 6 M hydrochloric acid. Reaction between Sodium thiosulphate and Hydrochloric Acid. Sodium formate solutions can be formulated to the required density as requested by the customer. There are five factors which effect the rate of reaction: temperature and concentration of the reactants, pressure (in gases) and the surface area of any solid reactants. Typically it is available as the white or colorless pentahydrate, Na 2 S 2 O 3 ·5H 2 O. temperature affects the rate of reaction between magnesium carbonate and dilute hydrochloric acid. Measure 20. contact cannot be tolerated.



I know the rate equation is : Rate= k [Na2S2O3]s [HCl]t If s = order of reaction for sodium thiosulphate and t = order of reaction for hydrochloric acid How do I find out the rate for s and the rate for t !!!!!. The effect of temperature on reaction rate - Royal Society of Chemistry In this experiment the effect of temperature on the rate of reaction between sodium thiosulfate and hydrochloric acid is investigated. She calculated the rate of the reaction. RE: What is the chemical formula for dilute hydrochloric acid? I need this answer quickly for an assignment and i also need to know the chemical formula for Dilute Hydrochloric Acid and Sodium Thiosulfate (Hypo) Solution. Temperature has a large effect on the rate of reaction. Jim Clark (2007) [5] stated that: As the quantity of sodium sulfate particles in a given volume increases, the number of collisions between the reactant particles (sodium thiosulfate and hydrochloric acid) will increase, therefore the rate increases. Temperature of the Reaction: Hydrochloric The oxidation-reduction reaction that occurs between hydrochloric acid and Acid-Sodium Thiosulfate sodium thiosulfate, Na,S,0,, produces insoluble sulfur as a product. 0 mol dm⁻³ hydrochloric acid into a glass bottle 2. There may be small amount of hydrochloric acid or sodium hydroxide to maintain the pH between 5. The aim of this experiment was to time how long it would take for chemical solution to be able to turn translucent. Reaction with air, water, and hydrogen. A solution approximately 0. The reaction between sodium thiosulphate(Na2S2O3) and hydrochloric acid (HCl) is usually the reaction chosen by most teachers to explain to their students the concept of kinetics and reaction rate. The reaction between sodium thiosulfate, Na 2S 2O 3, and iodine, I 2, is shown in equation 3. When water is mixed with sodium thiosulfate the surrounding area temperature decreases causing the temperature to become, colder. As the temperature of the sodium thiosulfate increased, the time taken for the mixture of sodium thiosulfate and hydrochloric acid to react decreased.



00 mol/dm3 hydrochloric acid into the 'acid' vial, and place the vial into the correct hole in the plastic container (i. The reaction of sodium chlorite with sodium sulfite is illustrated below. Adding calcium chloride to increase calcium hardness. 0 mol dm⁻³ hydrochloric acid into a glass bottle 2. Jim Clark (2007) [5] stated that: As the quantity of sodium sulfate particles in a given volume increases, the number of collisions between the reactant particles (sodium thiosulfate and hydrochloric acid) will increase, therefore the rate increases. You can also monitor the rate of reaction between the sodium thiosulfate and hydrochloric acid by using a light sensor. 1 N alkali required to neutralize the free acids in 10. sodium thiosulfate solution and dilute hydrochloric acid 10 cm3 of dilute hydrochloric acid was added separately to 50 cm-3 sodium thiosulfate solutions of five different concentrations. • When lower concentrations of sodium thiosulfate are used, the rate law does not appear to be as simple as predicted in this experiment. Add 1 mL of phenolphthalein TS, and titrate with 0. Add magnesium carbonate powder to the conical flask. Chemical Corrosion and Material Choice Guidance Chart Calcium hydroxide Yes Calcium hypochlorite Yes Caron tetrachloride Yes Carbonic acid Yes Chloroaccetic acid Stainless steel with PE lining Chlorine, dry Yes Chlorine, wet Tantalum or Hastelloy Chlorinc, acid Hastelloy Critic acid Yes Cooper sulfate Yes Ethanol Yes Ethylene glycol Yes. 2 - 500ml amber glass preserved with Sodium Thiosulfate for M515. Sodium Thiosulfate Sodium Hyposulfite Na2S2O3·5H2O Formula wt 248. of sodium thiosulfate increased.



025 M iodine. Sodium thiosulfate solution is a body tissue irritant. This makes the mixture difficult to see through. The reaction (Tikkanen and others 2001) of sodium ascorbate with chlorine is shown below: C 5 H 5 O 5 CH 2 ONa + HOCL → C 5 H 3 O 5 CH 2 OH + NaCl + H 2 O Sodium ascorbate + Hypochlorous acid → Dehydroascorbic acid + Sodium chloride + water Approximately 2. We'll use a reaction that is easy to do in school. 45 grams * Total mass lost to stripping process (M1 - M2): 0. She adds 25 cm³ of the acid to a weighed amount of the metal. Fill the three labeled pipets from the reaction plate. To investigate how the rate of the reaction of sodium thiosulfate with hydrochloric acid changes as the temperature of the reaction is changed. that the amounts of hydrochloric acid and sodium thiosulfate are constant. We do have a titration solution and indicator that can measure the amount of I 3-in the sample. In this experiment, we will be look intoing the consequence of temperature on the reaction between Sodium Thiosulphate and Hydrochloric Acid. This is particularly risky when investigating the effect of temperature on rate as the sulfur dioxide is driven out of solution at elevated temperatures. To determine whether H + ions in HCl act as a catalyst in the reaction between hydrochloric acid and sodium thiosulfate Introduction: A catalyst is a substance that increases the rate of the reaction by lowering down the reaction's activation energy. Magnesium + hydrochloric. An aqueous solution of 0. With continuous shaking, add 25 mL of a mixture of 6 volumes of hydrochloric acid and 94 volumes of water. sodium thiosulfate solution and dilute hydrochloric acid 10 cm3 of dilute hydrochloric acid was added separately to 50 cm-3 sodium thiosulfate solutions of five different concentrations. Use reagent grade.



The graph for reaction time versus concentration of acid for the reaction between sodium thiosulfate and dilute hydrochloric acid is shown below. Hydrochloric acid solution is corrosive to eyes and skin. Sodium Thiosulfate FCC Food Grade, US Food Chemical Codex Grade Specifications Sodium Hyposulfite Na2S2O3·5H2O Formula wt 248. (12) The reaction is described by the following balanced equation. The effect of temperature on reaction rate - Royal Society of Chemistry In this experiment the effect of temperature on the rate of reaction between sodium thiosulfate and hydrochloric acid is investigated. Symptoms include coughing, hoarseness, sneezing,tearing, and breathingdifficulty. The initial temperature of the solution was measured. Dissolve 12. You can also monitor the rate of reaction between the sodium thiosulfate and hydrochloric acid by using a light sensor. The reaction produces hydrogen gas. The actual amounts of bromine solution, acetone and hydrochloric acid to be used are left up to the individual experimenter. 5M of Hydrochloric acid. 24 M sodium thiosulfate, fill a second with 6. Sodium Thiosulphate + Hydrochloric acid »» Sulphur + Sodium Chloride + Sulphur Dioxide. I know the rate equation is : Rate= k [Na2S2O3]s [HCl]t If s = order of reaction for sodium thiosulphate and t = order of reaction for hydrochloric acid How do I find out the rate for s and the rate for t !!!!!. 14) Repeat for temperatures of 35, 40, 45 and 50 degrees.



c) Place both test tubes A and B in a water bath set at the desired temperature until the temperature of the solutions in the test tubes have reached the temperature of the bath (about 5-10 minutes). The effect of increasing the concentration on the rate of a reaction can be shown by looking at the reaction between sodium thiosulfate solution and dilute hydrochloric acid. • When lower concentrations of sodium thiosulfate are used, the rate law does not appear to be as simple as predicted in this experiment. (i) Calculate the heat energy produced by this reaction using the equation:. Sulfuric acid (H 2 SO 4) can be used as an alternative for acetic acid. K Cr O , g)(1000). The sodium hypochlorite reaction with water is similar to gaseous chlorine, forming sodium hydroxide (NaOH), hypochlorous acid (HOCl), hypochlorite ion (OCl-), and hydrogen ion (H+). Reaction of Sodium Thiosulphate with Hydrochloric acid Safety: Good laboratory practice should be followed. Hydrochloric acid reacts with sodium hydroxide to produce a salt, water and heat (chemical) 3. Its antioxidant properties are due to the presence of a reduced sulfur atom, but it also forms strong complexes with iron, copper, and other metal ions. This is particularly risky when investigating the effect of temperature on rate as the sulfur dioxide is driven out of solution at elevated temperatures. Sodium thiosulfate is an important inorganic salt with several medical uses. The Naxid B additive includes 20% sodium thiosulfate, 2% sodium sulfite, and the balance water, for enhancing effective corrosiveness of the composition while minimizing reaction time at the lowest practical temperature. This involves the oxidation of iodide to iodine and subsequent titration with sodium thiosulfate using starch as an indicator. Measure the loss in mass of the flask and contents every 20 seconds for. " Iron (III) Nitrate and Sodium Thiosulfate real uses I am doing an assignment for school (Year 11 Chemistry) and I have done the reaction of Iron (III) Nitrate and Sodium Thiosulfate, the assignment was all about testing the reaction when changing different varaibles (adding a catalyst, chaning particle size, changing temperature and changing.



sodium thiosulfate solution reacts with hydrochloric acid. We have the theoretical reaction Cu + 2HCl --> CuCl2 + H2 However it technically should not happen at room temperature. Melted sodium thiosulfate is very easy to overcool to room temperature and when crystallization is forced, the sudden temperature jump to 48. Hydrochloric Acid Hydrochloric Acid is a strong acid in terms of chemical ionization, and solutions of it can be assayed with a standardized solution of a strong base, such as Sodium Hydroxide. Sodium thiosulfate solution reacts with hydrochloric acid. Preparation of sodium tetrathionate dihydrate. To investigate how the rate of the reaction of sodium thiosulfate with hydrochloric acid changes as the temperature of the reaction is changed Measure out fixed volumes of sodium thiosulfate and hydrochloric acid, using a measuring cyclinder. Function of Na2CO3. Stand both in a beaker and record the start temperature 5. record the temperature of the sodium thiosulfate. The purpose of this experiment is to analyze the rate of reaction and the different parametric quantities that affect it. The temperature is maintained at 45 to 50 °C by adjusting the rate of addition and using an ice bath for cooling if necessary. , stirred solution therein. This makes the mixture difficult to see through. Hydrochloric Acid 10 150 10 200 Sodium Thiosulfate ALL 100 ALL 120 If unusual temperature conditions exist, the manufacturer should. 5000g copper (≥99. Sodium sulfite method Soda solution reacts with sulfur dioxide gas, and caustic soda was added, adding sodium sulfide to remove impurities by filtration, and then sulfur powder was dissolved in a hot solution of sodium sulfite to react, filter, remove impurities, and then filter repeatedly, add caustic alkali to process, through concentration, filtration, crystallization, centrifugal dewatering, screening, to obtain the finished product of sodium thiosulfate.



Have been asked to make improvements to the temperature and concentration. Sodium Thiosulfate FCC; US Food Chemical Codex. Sodium Thiosulphate Anhydrous Pentahydrate BP IP USP ACS AR Analytical Reagent FCC Food Grade Manufacturers. concentration of sodium thiosulfate is increased (2) (Total 6 marks) € €€€€€€€€€ A student does an experiment to examine the rate of reaction between magnesium and dilute hydrochloric acid. Procedure: 1. A Titration Method for Measuring Chlorate Ion in Concentrated Bleach Solutions The minimization of bleach loss is a high priority for sodium hypochlorite producers. Examining Sodium Thiosulphate And Hydrochloric Acid Reaction Rates Biology Essay. It is deliquescent in moist air and effloresces in dry air at a temperature above 33°. FURFURALDEHYDE - dropwise addition of the aldehyde to a 10% excess of sodium hypochlorite solution at 20-25 deg C (70-80 deg F) can lead to a violent explosion. bromide solution followed by 80 ml of concentrated Hydrochloric Acid. Heat energy is then. sulphur is produced. Lesmahagow High School Page 6 7. In deciding to use a medicine, the risks of taking the medicine must be weighed against the good it will do. 184 990 ESSAYS, term and research papers available for UNLIMITED access. This gas is toxic by inhalation and may cause burns; it can cause breathing difficulties and conjunctivitis. Decomposition of sodium hypochlorite takes place within a few seconds with the following salts: ammonium acetate, ammonium carbonate, ammonium nitrate, ammonium oxalate, and ammonium phosphate.



Before using sodium thiosulfate. This sodium triiodide solution is added to the sodium vanillate solution along with a catalytic amount of sulfuric acid--preferably from 5-10 mole %. The equation for this acid-catalysed reaction is as follows: S 2 O 3 2− (aq) → SO 3 2− (aq) + S(s) To demonstrate the concept of supercooling in physics classes. To Study the Effect of Concentration on the Rate of Reaction Between Sodium Thiosulphate and Hydrochloric Acid Theory According to the law of mass action, rate of a chemical reaction is directly proportional to the product of the molar concentrations of the reactants. To investigate the effects of change in concentration on the rate of reaction between Sodium Thiosulphate and Hydrochloric Acid. The thiosulfate–acid reaction Health and safety Hydrochloric acid is an irritant. 2 - 500ml amber glass preserved with Sodium Thiosulfate for M515. 5 Harneet and Mike investigate the reaction between sodium thiosulfate, Na 2S 2O 3, and hydrochloric acid, HCl. The actual amounts of bromine solution, acetone and hydrochloric acid to be used are left up to the individual experimenter. Students could investigate the effect of temperature on the rate of reaction of sodium thiosulfate and hydrochloric acid by an initial rate method. Adding stabiliser (cyanuric acid). Metal oxides react with acids to produce a salt and water. The sulphur forms in very small particles and. This report is offered as a guide and was developed from information, which, to the best of ENPAC’s knowledge, was reliable and accurate. She adds 25 cm³ of the acid to a weighed amount of the metal.



HCl + sodium thiosulfate sodium chloride + sulfur dioxide. 1 N sodium hydroxide solution and record the initial volume. The reaction is acid-catalysed, which means that the acid concentration is an important factor influencing when the reaction equilibrium is achieved. POOL VOLUME CALCULATOR. When Sodium Thiosulphate and dilute Hydrochloric acid …. 18 of 39 © Boardworks Ltd 2007 Effect of temperature on rate The higher the temperature, the faster the rate of a reaction. Sodium thiosulfate solution: Approximately 0. Chemical reaction 2. THE Chemical reaction: when Sodium Thiosulphate reacts with hydrochloric acid sulfur is produced. dilute hydrochloric acid and sodium thiosulfate is a redox reaction catalyzed by hydrogen ions. To Study the Effect of Concentration on the Rate of Reaction Between Sodium Thiosulphate and Hydrochloric Acid Theory According to the law of mass action, rate of a chemical reaction is directly proportional to the product of the molar concentrations of the reactants. Na 2 S 2O 3 (aq) + 2H Cl (aq) ˜ SO 2(aq) + S (s) + H 2 O (l) + 2Na Cl (aq) The sulphur will be deposited in the solution and causes the solution to become opaque. 24 M sodium thiosulfate solution dropwise to one of the Titertek strips according to table #1. The traditional experiment in which sodium thiosulfate solution reacts with acid is potentially hazardous as sulfur dioxide is released as a reaction product. Fill a 25 ml buret with the 0. The reaction of sodium thiosulfate and hydrochloric acid generates sulfur dioxide gas, which is a skin and eye irritant.



To investigate the effects of change in concentration on the rate of reaction between Sodium Thiosulphate and Hydrochloric Acid. The sulphur forms in very small particles and. Naxid C is preferably 14% sodium thiosulfate, 1. THE REACTION: when Sodium Thiosulphate reacts with hydrochloric acid. The Reaction. 5 g/l) is suitable. Sodium Thiosulphate + Hydrochloric acid »» Sulphur + Sodium Chloride + Sulphur Dioxide. For a reactions to occur, the particles must strike with enough energy. Washing with 10% aqueous sodium thiosulfate leads to a colorless organic phase, indicating total elimination of the. FORMIC ACID - becomes explosive at 55 deg C (131 deg F). Hydrochloric acid solution is corrosive to eyes and skin. 13) Repeat as steps 5-9. between an acid and a base depends on the amounts of acid and base that react. 5M should be labelled IRRITANT but this investigation does not need concentrations approaching 2M Reaction: Chloride displaces thiosulphate. This causes the cross to melt and finally disappear. As the temperature of the sodium thiosulfate increased, the time taken for the mixture of sodium thiosulfate and hydrochloric acid to react decreased.



Experiment 14: To Study the Effect of Concentration and Temperature on the Rate of Reaction between Sodium Thiosulfate and Hydrochloric Acid Experiment 15: To Determine the Total Hardness in a Water Sample Using Ethylenediaminetetraacetic Acid (EDTA Titration). 1 N Sodium Chloride TS (new), 8502 Specifications 10N Sulfuric Acid TS (new), 8502 Volumetric Solutions Dietary Supplements 0. The reaction produces hydrogen gas. bromide solution followed by 80 ml of concentrated Hydrochloric Acid. € A student used this method to study how changing the concentration of the sodium thiosulfate solution alters the rate of this reaction. Decomposition of sodium hypochlorite takes place within a few seconds with the following salts: ammonium acetate, ammonium carbonate, ammonium nitrate, ammonium oxalate, and ammonium phosphate. The time taken for this to achieve a given cloudiness provides a way to measure the reaction time. Hydrochloric acid reacts with sodium hydroxide to produce a salt, water and heat (chemical) 3. Jim Clark (2007) [5] stated that: As the quantity of sodium sulfate particles in a given volume increases, the number of collisions between the reactant particles (sodium thiosulfate and hydrochloric acid) will increase, therefore the rate increases. Due to the extensive scope of this field, the tabulation is not complete, nor is it conclusive. Thiosulfate occurs naturally and is produced by. 50 mL of either 0. Rate Of Reaction - Sodium Thiosulphate And Hydrochloric Acid Essays: Over 180,000 Rate Of Reaction - Sodium Thiosulphate And Hydrochloric Acid Essays, Rate Of Reaction - Sodium Thiosulphate And Hydrochloric Acid Term Papers, Rate Of Reaction - Sodium Thiosulphate And Hydrochloric Acid Research Paper, Book Reports. Add 20 ml of 10% Potassium Iodide solution and titrate the liberated iodine against 0. Corrosion is the destructive attack of metals by chemical or electrochemical reaction with its environment. 05 F in sodium thiosulfate is prepared in the following manner.



5 Harneet and Mike investigate the reaction between sodium thiosulfate, Na 2S 2O 3, and hydrochloric acid, HCl. The results are shown below. This is the method used. HCl is the chemical formula that represents hydrochloric acid. Clean test tube out and add 5mL of Hydrochloric acid to the test tube, place test tube in beaker. 4 Determination of the amount of water of crystallisation in hydrated sodium carbonate. The mean of these two temperatures may be taken as the reaction temperature. Examining Sodium Thiosulphate And Hydrochloric Acid Reaction Rates Biology Essay. The conical flaskwas placed on a. Experiment a) Using a 50 cm3 measuring cylinder, measure out 10 cm3 of the 0. Add magnesium carbonate powder to the conical flask. A small amount of Na 2 CO 3 is added to the solution in order to bring the pH to about 9. We then added 50 cm3 of Sodium Thiosulphate to the hydrochloric acid, and at this time we do not need to add any water. Ascorbic Acid + I 3-+ H 2 O Dehydroascorbic Acid + 3I-+ 2H+ It is this reaction that we use to measure indirectly the amount of Ascorbic Acid in the sample. Hypothesis My prediction is that the reaction between sodium thiosulphate and acid will be fastest when the acid is at its highest temperature and concentration. The different concentrations of hydrochloric acid are 0. A pellet of sodium.



Briefly describe your Preliminary Experiment and include your results. The reaction is acid-catalysed, which means that the acid concentration is an important factor influencing when the reaction equilibrium is achieved. To investigate the effects of change in concentration on the rate of reaction between Sodium Thiosulphate and Hydrochloric Acid. This handbook will discuss sodium hypochlorite solutions. Overview of the Experiment 1. The reaction (Tikkanen and others 2001) of sodium ascorbate with chlorine is shown below: C 5 H 5 O 5 CH 2 ONa + HOCL → C 5 H 3 O 5 CH 2 OH + NaCl + H 2 O Sodium ascorbate + Hypochlorous acid → Dehydroascorbic acid + Sodium chloride + water Approximately 2. Allow the water to cool to room temperature; then add about 25 g of Na 2S 2O 3 5H 2O and 0. DESCRIPTION. sulphur is produced. In case of serious skin contact, use water, a disinfectant soap, and anti-bacterial cream. € A student used this method to study how changing the concentration of the sodium thiosulfate solution alters the rate of this reaction. There is a very simple, but very effective, way of measuring the time taken for a small fixed amount of precipitate to form. 5 mEq/L, Calcium 2. Sodium Thiosulfate or Sodium Thiosulphate occurs as large, colorless crystals or as a coarse, crystalline powder. The four main variables that affect rate are: * Temperature - if the reactants are heated/cooled they have more/less energy. Pipette 100 ml of sample into 250 Erlenmeyer flask. The Effect on the concentration on the reaction between Sodium Thiosulphate and Hydrochloric acid. Calculate the rate of each reaction (volume ÷ time), and compare the results to find out which reaction has a faster rate. It is significantly more reactive in air as a liquid than as a solid, and the liquid can ignite at about 125 °C (257 °F). Sodium Thiosulfate And Hydrochloric Acid Temperature.