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Консультация № 189217
19.04.2016, 10:04
0.00 руб.
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Уважаемые эксперты! Пожалуйста, ответьте на вопрос:
Вычиcлить pH 0,26 M раствора синильной кислоты HCN
спасибо
Вычиcлить pH 0,26 M раствора синильной кислоты HCN
спасибо
Обсуждение
19.04.2016, 12:12
общий
это ответ
Здравствуйте, Katerina!
HCN=H++CN-
Ka=[H+][CN-]/[HCN]
pKa=9,21
C=0,26 M
равновесные концентрации
[H+]=[CN-]
[HCN]=C-[H+]
Ka=[H+]2/(С-[H+])
для настолько слабой кислоты при достаточной концентрации можно принять (С-[H+])[$8776$]С
Тогда
Ka=[H+]2/C
логарифмируем
lgKa=2lg[H+]-lgC
pKa=2pH+lgC
pH=(pKa-lgC)/2=(9,26-lg0,26)/2=9,84/2=4,92
Нетрудно убедиться, что степень диссоциации и вправду достаточно мала для использованного приближения
HCN=H++CN-
Ka=[H+][CN-]/[HCN]
pKa=9,21
C=0,26 M
равновесные концентрации
[H+]=[CN-]
[HCN]=C-[H+]
Ka=[H+]2/(С-[H+])
для настолько слабой кислоты при достаточной концентрации можно принять (С-[H+])[$8776$]С
Тогда
Ka=[H+]2/C
логарифмируем
lgKa=2lg[H+]-lgC
pKa=2pH+lgC
pH=(pKa-lgC)/2=(9,26-lg0,26)/2=9,84/2=4,92
Нетрудно убедиться, что степень диссоциации и вправду достаточно мала для использованного приближения
5
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