1) 2TiO + 3H2SO4 = Ti2(SO4)3 + H2 + 2H2O:
2Ti+2 -2e- = 2Ti3+ | 2 | 2 | 1 |
2H+ +2e- = H2 | 2 | | 1 |;
2) 3HClO3 = HClO4 + H2O + 2ClO2:
Cl+5 -2e- = Cl+7 | 2 | 2 | 1 |
Cl+5 +e- = Cl+4 | 1 | | 2 |;
3) K2Cr2O7 + 3(NH4)2S + H2O = 2Cr(OH)3 + 3S + 6NH3 + 2KOH:
2Cr+6 +6e- = 2Cr+3 | 6 | 6 | 1 |
S-2 -2e- = S | 2 | | 3 |.