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Консультация № 189119
08.04.2016, 08:57
0.00 руб.
08.04.2016, 14:56
0
1
1
Здравствуйте! У меня возникли сложности с таким вопросом:
Образуется ли осадок СаСО3 при смешении равных объемов 0,02 М растворов хлорида кальция CaCl2 и карбоната натрия Na2CO3?
Образуется ли осадок СаСО3 при смешении равных объемов 0,02 М растворов хлорида кальция CaCl2 и карбоната натрия Na2CO3?
Обсуждение
08.04.2016, 14:55
общий
это ответ
Здравствуйте, Katerina!
При смешивании получаем C(Ca2+)=C(CO32-)=0,01 M
Произведение растворимости KS(CaCO3)=[Ca2+][CO32-]=4,92[$183$]10-9 M2
Поскольку C(Ca2+)[$183$]C(CO32-)=10-4 M2>KS(CaCO3)
осадок образуется и большая часть этих окажется связана в форме CaCO3
Однако, если речь идет о растворимости карбонатов, нужно также учитывать гидролиз, поскольку в произведение растворимости входит только негидролизованная форма. Впрочем, в 0,01М растворе карбонат гидролизован лишь на ~14%, что на ответ о факте выпадения осадка повлиять в данном случае не может. А вот если бы требовалось найти концентрацию ионов кальция, оставшихся в растворе после выпадения осадка, то тут необходимо было бы также учитывать равновесие карбонатов и гидрокарбонатов.
При смешивании получаем C(Ca2+)=C(CO32-)=0,01 M
Произведение растворимости KS(CaCO3)=[Ca2+][CO32-]=4,92[$183$]10-9 M2
Поскольку C(Ca2+)[$183$]C(CO32-)=10-4 M2>KS(CaCO3)
осадок образуется и большая часть этих окажется связана в форме CaCO3
Однако, если речь идет о растворимости карбонатов, нужно также учитывать гидролиз, поскольку в произведение растворимости входит только негидролизованная форма. Впрочем, в 0,01М растворе карбонат гидролизован лишь на ~14%, что на ответ о факте выпадения осадка повлиять в данном случае не может. А вот если бы требовалось найти концентрацию ионов кальция, оставшихся в растворе после выпадения осадка, то тут необходимо было бы также учитывать равновесие карбонатов и гидрокарбонатов.
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