A solution contains \(2.00\,\text{moles}\) of acetic acid, \({\text{CH}}_{3}{\text{COOH}},\) and \(1.00\,\text{mole}\) of calcium acetate, \({\text{Ca}}\left({\text{CH}}_{3}{\text{COO}}_{2}\right)\text{,}\) in solution. The solution is able to resist addition of a small amount of strong acid or strong base without significant changes in the pH. Larger quantities of strong acid or strong base cause a significant change in pH. How many moles of nitric acid, \({\text{HNO}}_{3},\) may be added before the pH begins to change significantly?

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