Aqueous iron(III) nitrate mixed with aqueous sodium thiosulfate gives a purple mixture.
A reaction occurs in the mixture.
Once the reaction is finished, the solution changes from purple to colourless.
(main)[9]
Design an experiment to demonstrate that aqueous copper(II) sulfate increases the rate of this reaction.
Your response should contain:
- a method that names the apparatus you would use and the variables you would keep constant
- the measurements you must take during the experiment
- the results you would anticipate
- an explanation of how the results show that copper(II) sulfate increases the rate of the reaction.
Worked solution & mark scheme
This 9-mark question has a full step-by-step worked solution and mark scheme. One marking point: “Select suitable apparatus” …