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Консультация № 190241
07.12.2016, 09:00
0.00 руб.
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Здравствуйте! У меня возникли сложности с таким вопросом:
Вычислить степень гидролиза и концентрацию
раствора Pb(NO3)2, рН которого равен 4.
Вычислить степень гидролиза и концентрацию
раствора Pb(NO3)2, рН которого равен 4.
Обсуждение
10.12.2016, 13:26
общий
это ответ
Здравствуйте, papsi90!
Pb2++H2O=Pb(OH)++H+
pKa1=6,48
Это единственное протолитическое равновесие, наблюдаемое в значительной степени в растворе данной соли при данном pH
[Pb(OH)+]=[H+]=10-pH=10-4M
[Pb2+]=[Pb(OH)+][H+]/Ka1=10-2pH/10-pKa1=10pKa1-2pH=0,03 M
концентрация C(Pb(NO3)2)=[Pb2+]+[Pb(OH)+][$8776$]0,03 M
степень гидролиза [$945$]=[Pb(OH)+]/C(Pb(NO3)2)=10-4/0,03=0,33%
Pb2++H2O=Pb(OH)++H+
pKa1=6,48
Это единственное протолитическое равновесие, наблюдаемое в значительной степени в растворе данной соли при данном pH
[Pb(OH)+]=[H+]=10-pH=10-4M
[Pb2+]=[Pb(OH)+][H+]/Ka1=10-2pH/10-pKa1=10pKa1-2pH=0,03 M
концентрация C(Pb(NO3)2)=[Pb2+]+[Pb(OH)+][$8776$]0,03 M
степень гидролиза [$945$]=[Pb(OH)+]/C(Pb(NO3)2)=10-4/0,03=0,33%
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