The effect of temperature on the rate of a reaction can be studied using the reaction between sodium thiosulphate solution and dilute hydrochloric acid.

Thiosulphate          Hydrochloric      Chloride                                  Dioxide

                        Acid

When sodium thiosulphate solution and dilute hydrochloric acid are mixed, the solution goes cloudy. Eventually, it is not possible to see a cross through the beaker.

Preliminary Tests

Test 1:

We are going to be using thiosulphate at 0.25 maulers and 2.0 maulers. We will keep the temperature the same, which will be room temperature. We will do both the tests at the same time and see how long it takes to disappear.

Test 2:

We will keep the concentration levels the same, but we will change the temperatures. We will heat the dilute hydrochloric acid to 80ºC and place it in one beaker. In another beaker we will cool the dilute hydrochloric acid to 20ºC. We will do both the tests at the same time and see how long it takes to disappear.

The reason we are doing these tests to test the different speeds at which they react.

Prediction

I predict that the higher the concentration, the faster the faster the ‘x’ will disappear.

Reasons for prediction

Method

Fair Test

Results Table