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Консультация № 188928
12.03.2016, 22:53
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Здравствуйте! Прошу помощи в следующем вопросе:
Как изменится степень диссоциации,кнцентрация ионов водорода в 0,1н растворе уксусной кислоты обёмом 0,3мл если в раствор ввести 1-2 микрошпателя ацетата натрия.
Как изменится степень диссоциации,кнцентрация ионов водорода в 0,1н растворе уксусной кислоты обёмом 0,3мл если в раствор ввести 1-2 микрошпателя ацетата натрия.
Обсуждение
13.03.2016, 18:02
общий
это ответ
Здравствуйте, samstep.stepanov!
Из выражения константы диссоциации
Ka=[H+][CH3COO-]/[CH3COOH]
делаем вывод, что добавление ацетат-ионов приведёт к уменьшению концентрации H+.
При этом, если введённое количество ацетата соизмеримо с содержанием в растворе кислоты, то концентрация H+ уменьшится многократно.
Понятие степени диссоциации для подобной смеси требует уточнения, если её определять как
x=[H+]/([H+]+[CH3COOH])
то она также уменьшится пропорционально уменьшению [H+].
Из выражения константы диссоциации
Ka=[H+][CH3COO-]/[CH3COOH]
делаем вывод, что добавление ацетат-ионов приведёт к уменьшению концентрации H+.
При этом, если введённое количество ацетата соизмеримо с содержанием в растворе кислоты, то концентрация H+ уменьшится многократно.
Понятие степени диссоциации для подобной смеси требует уточнения, если её определять как
x=[H+]/([H+]+[CH3COOH])
то она также уменьшится пропорционально уменьшению [H+].
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