Investigating the rate of reaction of Sodium Thiosulphate and Hydrochloric Acid

The first 200 words of this essay...

Planning.

I predict that the higher the concentration then the faster the reaction, this is because when water is added the sodium thiosulphate solution and the hydrochloric acid have a more neutral pH and it becomes more dilute then it will be less reactive will the other particles in the solution.

Equation for my experiment:

Sodium thiosulphate + Hydrochloric acid Sulphur + Sodium chloride

Sulphur dioxide Water

Na2 S2 O2 + 2HCl 2Na Cl + SO2 + H2O + S

The apparatus needed include:

Goggles

3 Measuring cylinders (1 to measure sodium thiosulphate, another to measure hydrochloric acid and another for water)

1Beakers

A piece of paper or tile with a dark cross-marked on it

A stopwatch

The materials needed:

Hydrochloric acid

Sodium thiosulphate solution

Water

The only variable will be the volume of sodium thiosulphate.

The thing I will not change is the volume of hydrochloric acid.

I will measure the speed of reaction by timing it using a fairly reliable stopwatch to a hundredth of a second. I will measure the volume of hydrochloric acid 5 ml