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Консультация № 109902
17.11.2007, 21:03
0.00 руб.
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1
Зравствуйте! Вот такая задача:
ПР(PbJ2)=8,7•10<sup>–9</sup> при 25°С. Образуется ли осадок PbJ<sub>2</sub>, если смешать равные объемы 0,01н раствора Pb(NO<sub>3</sub>)<sub>2</sub> и 0,05н раствора KJ?
Буду благодарен за решение.
ПР(PbJ2)=8,7•10<sup>–9</sup> при 25°С. Образуется ли осадок PbJ<sub>2</sub>, если смешать равные объемы 0,01н раствора Pb(NO<sub>3</sub>)<sub>2</sub> и 0,05н раствора KJ?
Буду благодарен за решение.
Обсуждение
Неизвестный
17.11.2007, 22:50
общий
это ответ
Здравствуйте, piit!
ПР(PbI2)=[Pb(2+)]*[I(-)]^2 -- здесь концентрации в насыщенном растворе
Найдем концентрации этих ионов в полученном растворе
Если мы возьмем 1М р-р и добавим такой-же объем воды, то концентрация уменьшится в два раза. То же самое и здесь
С(Pb(2+)) = C(Pb(NO3)2)/2
Но так как здесь концентрация эквивалента, а эквивалентом является 1/2Pb(NO3)2, то С(Pb(2+))=0,01/4
C(I(-))=0,05/2 , эквивалент KI -- сама молекула
Найдем ионное произведение
(0,01/4)*(0,05/2)^2=1,5625*10^-6
Оно больше, чем в насыщенном растворе, поэтому осадок выпадет
ПР(PbI2)=[Pb(2+)]*[I(-)]^2 -- здесь концентрации в насыщенном растворе
Найдем концентрации этих ионов в полученном растворе
Если мы возьмем 1М р-р и добавим такой-же объем воды, то концентрация уменьшится в два раза. То же самое и здесь
С(Pb(2+)) = C(Pb(NO3)2)/2
Но так как здесь концентрация эквивалента, а эквивалентом является 1/2Pb(NO3)2, то С(Pb(2+))=0,01/4
C(I(-))=0,05/2 , эквивалент KI -- сама молекула
Найдем ионное произведение
(0,01/4)*(0,05/2)^2=1,5625*10^-6
Оно больше, чем в насыщенном растворе, поэтому осадок выпадет
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