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Консультация № 189121
08.04.2016, 08:58
0.00 руб.
08.04.2016, 16:57
0
1
1
Уважаемые эксперты! Пожалуйста, ответьте на вопрос:
Сколько нужно прибавить ацетат натрия CH3COONa к 1 л 0,1 н. раствора CH3COOH, чтобы концентрация ионов водорода стала 1[$183$]10-6 моль/л?
спасибо
Сколько нужно прибавить ацетат натрия CH3COONa к 1 л 0,1 н. раствора CH3COOH, чтобы концентрация ионов водорода стала 1[$183$]10-6 моль/л?
спасибо
Обсуждение
08.04.2016, 16:56
общий
это ответ
Здравствуйте, Katerina!
Ka=[H+][CH3COO-]/[CH3COOH]=1,762[$183$]10-5M
Учитывая, что концентрация [H+] крайне мала по сравнению с количеством кислоты [CH3COOH]=0,1 M
[CH3COO-]=Ka[CH3COOH]/[H+]=1,762 M
То есть к 1 литру раствора нужно добавить 1,762 моль (144,5 г) ацетата натрия (без учёта изменения объёма. А впрочем, оно ничего не изменит, поскольку важно именно отношение концентраций обеих протолитических форм).
Ka=[H+][CH3COO-]/[CH3COOH]=1,762[$183$]10-5M
Учитывая, что концентрация [H+] крайне мала по сравнению с количеством кислоты [CH3COOH]=0,1 M
[CH3COO-]=Ka[CH3COOH]/[H+]=1,762 M
То есть к 1 литру раствора нужно добавить 1,762 моль (144,5 г) ацетата натрия (без учёта изменения объёма. А впрочем, оно ничего не изменит, поскольку важно именно отношение концентраций обеих протолитических форм).
5
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