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Консультация № 188862
28.02.2016, 10:51
0.00 руб.
28.02.2016, 13:37
0
3
1
Уважаемые эксперты! Пожалуйста, ответьте на вопрос: закончить уравнения химических реакций с расстановкой коэффициентов
K2Cr2O7+H2SO4 разбавлен.=
K2Cr2O7 + KOH =
K2Cr2O7 +KOH + Na2S =
K2Cr2O7 +H2SO4 + Na2S =
K2Cr2O7+H2SO4 разбавлен.=
K2Cr2O7 + KOH =
K2Cr2O7 +KOH + Na2S =
K2Cr2O7 +H2SO4 + Na2S =
Обсуждение
28.02.2016, 15:09
общий
это ответ
Здравствуйте, samstep.stepanov!
K2Cr2O7+H2SO4 разбавлен. - не реагируют
А вот в концентрированной серной кислоте можно из дихромата получить кристаллы CrO3
K2Cr2O7 + 2KOH = 2K2CrO4 + H2O
Дихромат является димерной формой гидрохромата, поэтому равновесие хромат-дихромат сильно зависит от pH.
K2Cr2O7 + 7H2O + 3Na2S = 2Na3[Cr(OH)6] + 3S + 2KOH
или, учитывая форму окислителя в щелочной среде,
2K2CrO4 + 8H2O + 3Na2S = 2Na3[Cr(OH)6] + 3S + 4KOH
4K2Cr2O7 + 16H2SO4 + 3Na2S = 4Cr2(SO4)3 + 4K2SO4 + 3Na2SO4 +16H2O
Потенциал Cr+6/Cr+3 изменяется более чем на 1,3 В между сильнокислой и сильнощелочной средой, поэтому продукты окисления сульфидов настолько различаются.
K2Cr2O7+H2SO4 разбавлен. - не реагируют
А вот в концентрированной серной кислоте можно из дихромата получить кристаллы CrO3
K2Cr2O7 + 2KOH = 2K2CrO4 + H2O
Дихромат является димерной формой гидрохромата, поэтому равновесие хромат-дихромат сильно зависит от pH.
K2Cr2O7 + 7H2O + 3Na2S = 2Na3[Cr(OH)6] + 3S + 2KOH
или, учитывая форму окислителя в щелочной среде,
2K2CrO4 + 8H2O + 3Na2S = 2Na3[Cr(OH)6] + 3S + 4KOH
4K2Cr2O7 + 16H2SO4 + 3Na2S = 4Cr2(SO4)3 + 4K2SO4 + 3Na2SO4 +16H2O
Потенциал Cr+6/Cr+3 изменяется более чем на 1,3 В между сильнокислой и сильнощелочной средой, поэтому продукты окисления сульфидов настолько различаются.
5
29.02.2016, 00:00
общий
Адресаты:
Спасибо за оказанную помощь. Прошу, если не трудно, закончить уравнение дихромата калия с едким калием и сульфидом натрия. Это 3я реакция сверху в заявке. С уважением Владимир.
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