Electrolysis of sodium hydroxide solution with indicator
In aqueous sodium hydroxide, the electrolyzed solution is basic at both electrodes.
pH
Electrolysis of sodium chloride solution with indicator
In neutral sodium chloride, base is produced at the cathode and acid at the anode.
Electrolysis of a sodium sulfate solution
An electric current is passed through a sodium sulfate solution. Gases are collected at the electrodes are tested for pH.
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