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Задать вопрос экспертам

Консультация № 167401

15.05.2009, 22:58

0.00 руб.

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Образование

[size=3]Уважаемые химиковеды, помогите с решением следующей задачи:

Произведение растворимости CaCO₃ 4,8[$149$]10^-9 . Вычислите растворимость этой соли в молях на литр и в граммах на литр.

Ответ: 6,9[$149$]10[sup]-5[/sup] ;6,9[$149$]10[sup]-3[/sup] .

Отблагодарю по заслугам...[/size]

Обсуждение

давно

Roman Chaplinsky / Химик CH

Модератор
156417
2175

16.05.2009, 00:02

общий

это ответ

Здравствуйте, Барштывкаев Рамиль !
Уравнение диссоциации
CaCO₃[$8596$]Ca²⁺+CO₃^2-
При этом ионы образуются в равных количествах и их концентрация и является молярной концентрацией растворённого вещества
[Ca²⁺]=[CO₃^2-]=C(CaCO₃)
Произведение (константа) растворимости
K_S=[Ca²⁺]*[CO₃^2-]=[Ca²⁺]²=C(CaCO₃)²
Отсюда получаем молярную растворимость
C(CaCO₃)=[$8730$]K_S=[$8730$](4,8*10^-9)=6,9*10^-5 моль/л
И растворимость в граммах на литр S=C*M=6,9*10^-5моль/л*100г/моль=6,9*10^-3 г/л

5

nice

Неизвестный

16.05.2009, 22:14

общий

это ответ

Здравствуйте, Барштывкаев Рамиль !
ПР(CaCO3) = 4,8*10(-9)

Растворимость соли в моль/л
S = [ ПР(CaCO3) ]в степени 1/2 = [ 4,8*10(-9) ]в степени 1/2 = 6,9*10-5 моль/л

Растворимость соли в г/л
S = S * M(CaCO3) = 6,9*10(-5) * 100 = 0,0069 г/л

5

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