1. FeCl + 3NaOH = Fe(OH)3 + 3NaCl
FeЗ+ + 3Cl- + 3Nа+ + 3ОН- = Fе(ОН)3↓ + 3Nа+ + 3Cl-
Fe3+ + 3OH-= Fe(OH)3↓
2. KOH + HCl = KCl + H2O
K+ + OH- + H+ + Cl- = K+ + Cl- + H2O
H+ + OH– = H2O
3. CaO + 2HNO3 = Ca(NO3)2+ H2O
CaO + 2H+ + 2NO3- = Ca2+ + 2NO3- + H2O
CaO + 2H+ = Ca2+ + H2O
4. CuCl2 + 2KOH = 2KCl + Cu(OH)2↓
Cu2+ + 2Cl- + 2K+ + 2OH- = 2K+ + 2Cl- + Cu(OH)2↓
Cu2+ + 2OH- = Cu(OH)2↓