Answer :
Addition of pure water does not change pH of a solution because pure water has neutral pH.
Why the pH does not change when pure water is added?
Even though you continue to add pure water into a substance, the acidity or alkalinity of substance still remains the same to that of substance because pure water has neutral pH which can't change the acidity or alkalinity of a solution.
So we can conclude that addition of pure water does not change pH of a solution because pure water has neutral pH.
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