A student sets up the apparatus shown in Figure 1 to electrolyse aqueous sodium sulfate, Na2SO4\text{Na}_2\text{SO}_4Na2SO4, and collect the gases produced at the inert carbon electrodes.

Describe how the use of the graduated measuring cylinders in Figure 1 improves the student's ability to investigate the stoichiometry of the decomposition of water compared to using standard, ungraduated test-tubes.
Practise Edexcel GCSE Chemistry Electrolytic processes with exam-style questions for Foundation and Higher tier. 100 questions, matched to the Edexcel GCSE Chemistry (1CH0) specification and written in Paper 1 and Paper 2 style. Every question includes a full worked solution and mark scheme, so you can see where marks are awarded rather than just whether you got the answer right.