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Консультация № 189194
14.04.2016, 22:52
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Уважаемые эксперты! Пожалуйста, ответьте на вопрос: ОЧЕНЬ СРОЧНО! ПОМОГИТЕ!!
Рассматриваются растворы 2-х электролитов, молярная концентрация ка-
ждого из которых равна СМ. Определить силу электролитов и записать уравнения их диссоциа-
ции. Назвать электролиты (см. контр. раб. «Классы неорганических соединений»).
Для сильного электролита определить молярную концентрацию каждого иона, считая,
что сильный электролит диссоциирует полностью.
Для слабого электролита записать выражение константы диссоциации и определить её
значение, если степень диссоциации слабого электролита равна α.
Определить значение рН растворов сильного и слабого электролитов.
Численные значения СМ и α: СМ=0,01моль/л; α=3,2⋅10-4.
Электролиты: [Zn(NH3)4](OH)2 и HSbO2.
Рассматриваются растворы 2-х электролитов, молярная концентрация ка-
ждого из которых равна СМ. Определить силу электролитов и записать уравнения их диссоциа-
ции. Назвать электролиты (см. контр. раб. «Классы неорганических соединений»).
Для сильного электролита определить молярную концентрацию каждого иона, считая,
что сильный электролит диссоциирует полностью.
Для слабого электролита записать выражение константы диссоциации и определить её
значение, если степень диссоциации слабого электролита равна α.
Определить значение рН растворов сильного и слабого электролитов.
Численные значения СМ и α: СМ=0,01моль/л; α=3,2⋅10-4.
Электролиты: [Zn(NH3)4](OH)2 и HSbO2.
Обсуждение
15.04.2016, 00:06
общий
это ответ
Здравствуйте, ket9999!
[Zn(NH3)4](OH)2 - гидроксид тетрааминцинка
Это комплекс с гидроксидом во внешней сфере. Его модно рассматривать как сильное основание при условиях, в которых комплексный ион достаточно стабилен.
[Zn(NH3)4](OH)2[$8594$][Zn(NH3)4]2++2OH-
[Zn(NH3)4]2+]=0,01 М
[OH-]=0,02 М
pH=14+lg[OH-]=12,3
HSbO2 - метасурьмянистая кислота
По аналогии с элементами этой группы можно предположить, что эта кислота весьма слабая.
HSbO2=H++SbO2-
при [$945$]=3,2[$183$]10-4
концентрация продуктов диссоциации
[H+]=[SbO2-]=С[$183$][$945$]=3,2[$183$]10-6 M
(диссоциацией воды всё ещё можно пренебречь)
концентрация недиссоциированной кислоты практически не отличается от исходной
[HSbO2]=0,01 M
Ka=[H+][SbO2-]/[HSbO2]=1,0[$183$]10-9
pH=-lg[H+]=5,5
[Zn(NH3)4](OH)2 - гидроксид тетрааминцинка
Это комплекс с гидроксидом во внешней сфере. Его модно рассматривать как сильное основание при условиях, в которых комплексный ион достаточно стабилен.
[Zn(NH3)4](OH)2[$8594$][Zn(NH3)4]2++2OH-
[Zn(NH3)4]2+]=0,01 М
[OH-]=0,02 М
pH=14+lg[OH-]=12,3
HSbO2 - метасурьмянистая кислота
По аналогии с элементами этой группы можно предположить, что эта кислота весьма слабая.
HSbO2=H++SbO2-
при [$945$]=3,2[$183$]10-4
концентрация продуктов диссоциации
[H+]=[SbO2-]=С[$183$][$945$]=3,2[$183$]10-6 M
(диссоциацией воды всё ещё можно пренебречь)
концентрация недиссоциированной кислоты практически не отличается от исходной
[HSbO2]=0,01 M
Ka=[H+][SbO2-]/[HSbO2]=1,0[$183$]10-9
pH=-lg[H+]=5,5
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