Question: explain why the pH does not change significantly when a small amount of an acid or base is added to a solution that contains equal

explain why the pH does not change significantly when a small amount of an acid or base is added to a solution that contains equal amounts of the acid H3PO4 and a salt of its conjugate base NaH2PO4

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General Chemistry 9th edition by Darrell Ebbing, Steven D. Gammon