The electrolysis of some other solutions using inert electrodes
1 mark · EasyState the ion that will produce oxygen gas at the anode, instead of a halogen, during the electrolysis of an aqueous solution.
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hydroxide ion (OH⁻)
Also accept: OH⁻; hydroxide
Common mistakes: Sulfate; Halide ions such as chloride or bromide
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Marking points
B1 · 1 mark · States 'hydroxide' or 'OH⁻' as the ion that produces oxygen at the anode.
Worked solution
The hydroxide ion (OH⁻) produces oxygen gas at the anode during the electrolysis of most aqueous solutions, except halides.