1) AlCl₃+3KOH=Al(OH)₃+3KCl
Al+3Cl+3K+3OH=Al(OH)₃+3K+3Cl
Al+3OH=Al(OH)₃
2) 2) K₂SiO₃+2HNO₃=2KNO₃+H₂SiO₃
2K+SiO₃+2H+2NO₃=2K+2NO₃+H₂SiO₃
SiO₃+2H=H₂SiO₃
3) CuCO₃+2HCL=CuCl₂+H₂CO₃
CuCO₃+2H+2Cl=Cu+2Cl+2H+CO₃
CuCO₃= Cu+CO₃
4) Al(OH)₃+3HBr=AlBr₃+3H₂O
Al(OH)₃+3H+3Br=Al+3Br+3H₂O
Al(OH)₃+3H=Al+3H₂O