Concentrated sodium chloride solution (brine) undergoes electrolysis, which produces a gaseous product at the positive electrode (anode).
A student collects a sample of this gas and tests it by inserting a piece of damp blue litmus paper into the test tube.
State what would be observed.
83 exam-style questions on Edexcel GCSE Chemistry 4.2 Electrolytic processes, covering 4.2.1 Electrolytes and the process of electrolysis, 4.2.2 Products of electrolysis using inert electrodes, 4.2.3 Half equations, oxidation and reduction in electrolysis, and 4.2.4 Electrolysis of copper sulfate and purifying copper. Each one has a worked solution and a mark scheme showing where the marks go.