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Консультация № 197608
19.01.2020, 15:28
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Здравствуйте! У меня возникли сложности с таким вопросом:
Какое значение рН (больше или меньше 7) имеют раствор гидрофосфата калия? Составьте ионные и молекулярные уравнения гидролиза этой соли
Какое значение рН (больше или меньше 7) имеют раствор гидрофосфата калия? Составьте ионные и молекулярные уравнения гидролиза этой соли
Обсуждение
23.01.2020, 21:16
общий
это ответ
Здравствуйте, VASJ!
Кислые соли обычно способны как диссоциировать дальше, высвобождая ионы H+, так и гидролизоваться, образуя ионы OH-
Так гидрофосфат-ион может диссоциировать
HPO42-=H++PO43- pKa3=12.37
и гидролизоваться
HPO42-+H2O=H2PO4-+OH- pKa2=7.20
Оценить pH раствора такого электролита можно, найдя среднее арифметическое обеих задействованных констант кислотности
pH=(7.20+12.37)/2=9.79 (pH>7)
уравнение гидролиза
K2HPO4+H2O=KH2PO4+KOH
Кислые соли обычно способны как диссоциировать дальше, высвобождая ионы H+, так и гидролизоваться, образуя ионы OH-
Так гидрофосфат-ион может диссоциировать
HPO42-=H++PO43- pKa3=12.37
и гидролизоваться
HPO42-+H2O=H2PO4-+OH- pKa2=7.20
Оценить pH раствора такого электролита можно, найдя среднее арифметическое обеих задействованных констант кислотности
pH=(7.20+12.37)/2=9.79 (pH>7)
уравнение гидролиза
K2HPO4+H2O=KH2PO4+KOH
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