Seawater electrolysis
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After seawater electrolysis to produce chlorine, does the pH of the solution increase or decrease?
If hydrogen is precipitated from the cathode, the overall pH value will increase, that is, during the electrolysis process, sodium chloride will be decomposed into hydrochloric acid (hydrochloric acid will then be decomposed into chlorine and hydrogen) and sodium hydroxide. But if a cathode with a high polarization potential (such as mercury) is used, the pH value of the solution will not change. This process is equivalent to breaking down sodium chloride into chlorine and sodium, with the sodium dissolving into the mercury.
Pure electrolysis products, the pH becomes larger. If you add acid for activation, the pH may be lower than 7. It depends on the amount of acid added.