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vozjaevfilipp
@vozjaevfilipp
October 2021
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Решите пожалуйста K2Cr2О7 + H2S + H2SO4 → Cr2(SO4)3 + S + K2SO4 + H2О,
HNO2 → HNO3 + NO +H2O.
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gavrilka
1) K2Cr2O7 + 3H2S + 4H2SO4 = Cr2(SO4)3 + 3S + K2SO4 + 7H2O
Cr2O7(2-) + H2S <-> 2Cr(3+) + S + H2O
Cr2O7(2-) + 14H(+) +6e -> 2Cr(3+) + 7H2O |1 ок-ль
H2S -2e -> S(0) + 2H(+) |3 вост-ль
______________________________________
Cr2O7(2-) + 14H(+) + 3H2S -> 2Cr(3+) + 7H2O + 3S + 6H(+)
Cr2O7(2-) + 8H(+) + 3H2S -> 2Cr(3+) + 7H2O + 3S
2) 3HNO2 = HNO3 + 2NO + H2O
N(3+) -2e -> N(5+) | 1 в-ль
N(3+) +1e -> N(2+) | 2 ок-ль
____________________
3N(3+) -> N(5+) + 2N(2+)
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Answers & Comments
Cr2O7(2-) + H2S <-> 2Cr(3+) + S + H2O
Cr2O7(2-) + 14H(+) +6e -> 2Cr(3+) + 7H2O |1 ок-ль
H2S -2e -> S(0) + 2H(+) |3 вост-ль
______________________________________
Cr2O7(2-) + 14H(+) + 3H2S -> 2Cr(3+) + 7H2O + 3S + 6H(+)
Cr2O7(2-) + 8H(+) + 3H2S -> 2Cr(3+) + 7H2O + 3S
2) 3HNO2 = HNO3 + 2NO + H2O
N(3+) -2e -> N(5+) | 1 в-ль
N(3+) +1e -> N(2+) | 2 ок-ль
____________________
3N(3+) -> N(5+) + 2N(2+)