The rate of reaction between Sodium Thiosulphate and hydrochloric acid

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Chemistry investigation the rate of reaction between

Sodium Thiosulphate and hydrochloric acid

The question I am going to investigate is how the level of concentration would affect the rate of reaction.

I am going to do this by diluting sodium disulphate with hydrochloric acid and time it at every step. Because I would want to see how the concentration affects the rate of reaction.

Sodium Thiosulphate + Hydrochloric Acid → Sodium Chloride + Sulphur Dioxide + water + Sulphur

Na2S2O3+ 2HCl  2NaCl + SO2+ H2O + S

                   

 Equipment

Three different sized Beakers for hydrochloric acid, sodium Thiosulphate        

Two measuring cylinders to measure solutions

Two pipettes to obtain the correct volume of hydrochloric acid and sodium Thiosulphate

 A stop clock used to time the reaction.

One conical flask used as a reaction the container in which the reactants were added together and the reaction allowed to progress

This equipment will help me more accurate, reliable results.

 

The variable I have chosen to investigate are:

       • Input sodium thiosulphalte concentration        

       • Output reaction

I predict that the more the concentration the faster the chemical reaction.

The scientific reason for my predication is the more the concentration the quicker the reaction. Also if we increased the amount of Sodium Thiosulphate in the solution, the rate of reaction might increase. If there is a higher concentration of the Sodium Thiosulphate to react with the Hydrochloric acid, there will be a greater number of collisions, so leading to a faster reaction time.

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I will have to keep a number of factors under control and not change a few things. I will have to keep the temperature of the heat roughly the same. This is because different levels of heat would increase or decrease the reaction– if it is different for every test, then it would not be a fair test.

        I will need to make sure nobody shakes the beaker because that can move the solution and cause it to react faster. Doing this would make each test different because it will change the speed of reaction in each test and ...

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