Na2CO3 + Ca(OH)2 → 2NaOH + CaCO3
2KCl + H2S → K2S + 2HCl
MgCl2 + H2 → Mg + 2HCl
Al(OH3) + HF → AlF3 + H2O
NaOH + HBr → NaBr + H2O
BF3 + 3H2O → H3BO3 + 3HF
B2O3 + 6HCl → 2BCl3 + 3H2O
PbO2 + 4HCl → PbCl4 + 2H2O
CaF2 + H2SO4 → CaSO4 + 2HF
FeS + 2HCl → FeCl2 + H2S
2NH4Cl + Ca(OH)2 → CaCl2 + 2NH3 + 2H2O