Fe(OH)3 + 3HCl = FeCl3 + 3H2O
Fe(OH)3 + 3H+ + 3Cl- = Fe3+ + 3Cl- + 3H2O
Fe(OH)3 + 3H+ = Fe3+ + 3H2O
K2CO3 + 2HCl = 2KCl + H2O + CO2↑
2K+ + CO32- + 2H+ + 2Cl- = 2K+ + 2Cl- + H2O + CO2↑
CO32- + 2H+ = H2O + CO2↑
Mg + 2HCl = MgCl2 + H2↑
Mg + 2H+ + 2Cl- = Mg2+ + 2Cl- + H2↑
Mg + 2H+ = Mg2+ + H2↑
MgO + 2HCl = MgCl2 + H2O
MgO + 2H+ + 2Cl- = Mg2+ + 2Cl- + H2O
MgO + 2H+ = Mg2+ + H2O
3. Ответ:
А | Б |
---|---|
4 | 2 |
4. 4Zn + 5H2SO4 = 4ZnSO4 + H2S + 4H2O