Овр: k2cr2o7 + sncl2 + h2so4 = cr2(so4)3 + h2o + - вопрос №17895652272242432244243 от 20AKE04 31.12.2020 19:23

Question

Химия: Овр: k2cr2o7 + sncl2 + h2so4 = cr2(so4)3 + h2o + k2so4 + sn(so4)2 + sncl4 ash3 + agno3 + h2o = h3aso4 + ag + hno3

20AKE04 · Answer

1) K2Cr2O7 + 3SnCl2 + 7H2SO4 = Cr2(SO4)3 + 7H2O + 2KCl + SnCl4 + 2Sn(SO4)2, баланс:

2Cr+6 +6e- = 2Cr+3      | 6 | 6 | 1 |

Sn+2 -2e- = Sn+4   | 2 |    | 3 |;

2) AsH3 + 8AgNO3 + 4H2O = H3AsO4 + 8Ag + 8HNO3, баланс:

As-3 -8e- = As+5   | 8 | 8 | 1 |

Ag+ +e- = Ag    | 1 |    | 8 |.