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Консультация № 114983
20.12.2007, 09:16
0.00 руб.
0
1
1
Здравствуйте уважаемые эксперты, полмогите пожалуйсто написать к обменным реакциям ионно-молекулярные, а к окислительно-восстановительным-электронные уравнения, с этим совсем туго, а сдавать уже пора.
Задание:
Сr2O3---->K2CrO4------>K2Cr2O7------>Cr2(SO4)3------->K3[Cr(OH)3].
К обменным реакциям составьте ионно-молекулярные уравнения, к окислительно-восстановительным-электронные уравнения.
Решение:
+3 +6
Сr2O3+2KOH=K2CrO4+H2O +Cr ?, если нет куда же он девается
реакция ионного обмена
+6 +6
2K2CrO4+H2SO4=K2Cr2O7+K2SO4+H2O
реакция ионного обмена
+6 +4 +3 +6
K2Cr2O7+3Na2SO3+4H2SO4=K2SO4+Cr2(SO4)3+3Na2SO4+4H2O
окислительно-восстановительная реакция
Cr(SO4)3+3KOH=K3[Cr(OH)3]+3SO4 ?
реакция ионного обмена.
Задание:
Сr2O3---->K2CrO4------>K2Cr2O7------>Cr2(SO4)3------->K3[Cr(OH)3].
К обменным реакциям составьте ионно-молекулярные уравнения, к окислительно-восстановительным-электронные уравнения.
Решение:
+3 +6
Сr2O3+2KOH=K2CrO4+H2O +Cr ?, если нет куда же он девается
реакция ионного обмена
+6 +6
2K2CrO4+H2SO4=K2Cr2O7+K2SO4+H2O
реакция ионного обмена
+6 +4 +3 +6
K2Cr2O7+3Na2SO3+4H2SO4=K2SO4+Cr2(SO4)3+3Na2SO4+4H2O
окислительно-восстановительная реакция
Cr(SO4)3+3KOH=K3[Cr(OH)3]+3SO4 ?
реакция ионного обмена.
Обсуждение
20.12.2007, 09:40
общий
это ответ
Здравствуйте, Незнайка!
1) Cr2O3 + 10KOH + 3Cl2 => 2K2CrO4 + 6KCl + 5H2O
Cr3+ - 3e- = Cr6+ |*2
Cl2 + 2e- => 2Cl- |*3 окислительно-восстановительная
2)2K2CrO4 + H2SO4 => K2Cr2O7 + K2SO4 + H2O
2CrO4(2-) + 2H+ => Cr2O7(2-) + H2O
реакция ионного обмена
3)K2Cr2O7 + 3Na2SO3 + 4H2SO4 = K2SO4 + Cr2(SO4)3 + 3Na2SO4 + 4H2O
Cr6+ + 3e- => Cr3+ |*2
S4+ - 2e- => S6+ |*3
окислительно-восстановительная реакция
Cr2(SO4)3 + 12KOH => 2K3[Cr(OH)6] + 3K2SO4
Cr3+ + 6OH- => [Cr(OH)6]3-
1) Cr2O3 + 10KOH + 3Cl2 => 2K2CrO4 + 6KCl + 5H2O
Cr3+ - 3e- = Cr6+ |*2
Cl2 + 2e- => 2Cl- |*3 окислительно-восстановительная
2)2K2CrO4 + H2SO4 => K2Cr2O7 + K2SO4 + H2O
2CrO4(2-) + 2H+ => Cr2O7(2-) + H2O
реакция ионного обмена
3)K2Cr2O7 + 3Na2SO3 + 4H2SO4 = K2SO4 + Cr2(SO4)3 + 3Na2SO4 + 4H2O
Cr6+ + 3e- => Cr3+ |*2
S4+ - 2e- => S6+ |*3
окислительно-восстановительная реакция
Cr2(SO4)3 + 12KOH => 2K3[Cr(OH)6] + 3K2SO4
Cr3+ + 6OH- => [Cr(OH)6]3-
Форма ответа
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