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The Rate of Reaction Between Sodium Thiosulphate Solution and Dilute Hydrochloric Acid.

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Introduction I have been asked to investigate one factor that affects the rate of reaction between Sodium Thiosulphate solution and dilute Hydrochloric Acid. The reaction Sodium Thiosulphate is a solution made up Sodium, Sulphur and Oxygen. Equation: Na2S2O3 Dilute Hydrochloric Acid is an acid containing Hydrogen and Chlorine. Equation: 2HCl When Sodium Thiosulphate is mixed with dilute Hydrochloric Acid a reaction occurs. This reaction forms a precipitate of yellow sulphur as one of the products. This precipitate can be used to measure the rate of this reaction. Equation: Sodium + Hydrochloric � Sulphur + Sodium + Sulphur + Water Thiosulphate Acid chloride Dioxide Na2S2O3 (aq) + 2HCl (aq) � S (s) + 2NaCl (aq) + SO2 (g) + H2O Uses of Sodium Thiosulphate Sodium Thiosulphate is used for: 1. Developing photographs 2. Titration of iodides Factors affecting the Rate of Reaction There are five factors that affect the rate of a reaction: 1. ...read more.


4. Light: Light only affects a small number of reactions. For example, light is required for photosynthesis to take place. 5. Concentration: The higher the concentrating of the solution, the more particles of solution there is to react. Therefore there are more collisions due to the fact that there are more particles. High Concentration Low Concentration As the reaction is between two solutions, Sodium Thiosulphate and Hydrochloric Acid, particle size is irrelevant. Also through thorough research I know of no known catalyst for this reaction. Sunlight doesn't affect this reaction either so that only leaves two factors, concentration and temperature. I have decided not to investigate the affect of temperature, as it is very difficult to get an accurate temperature reading. This is due to the fact that heat will be lost between heating and mixing of the two solutions. I have therefore decided to investigate the affect of concentration on the rate of reaction. ...read more.


* The beaker is then rinsed several times with distilled water, which is also added to the flask. More distilled water is then added from a wash bottle to bring the volume up to 250cm3. * The flask is inverted several times to ensure the solution is well mixed. * This solution is then added to a previously rinsed burette and the desired volume is measured out into a conical flask. * Another burette is then filled with distilled water and the desired volume is measured into the conical flask. * The acid is then added to the solution in the flask and the stop clock is started. Results Concentration Time taken for X to disappear/ mins, secs A B C D Safety To ensure that this experiment is carried out as safely as possible, the following safety procedures must be followed: * Safety goggles must be worn at all times during the experiment. Sources of error Human error - when measuring out the solutions people may incorrectly measure them out. Chemistry Coursework Aran Stewart 1 ...read more.

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