H₂SiO₃ +2NaOH →Na2SiO3+2H2O H2SiO3+2Na+2OH=2Na+SiO3+2H2O H2SiO3+2OH=SiO3+2H2O NaCl + AgNO₃ → AgCl+NaNO3 Na+Cl+Ag+NO3=AgCl+Na+NO3 Ag+Cl=AgCl K₂CO₃ + 2HCl→ 2KCl+CO2+H2O 2K+CO3+2H+2Cl=2K+2Cl+CO2+H2O 2H+CO3=CO2+H2O 2)CuCl2+Na2S=CuS+2NaCl Cu+2Cl+2Na+S=CuS+2Na+2Cl Cu+S=CuS Pb(NO3)2+2KOH=Pb(OH)2+2KNO3 Pb+2NO3+2K+2OH=Pb(OH)2+2K+2NO3 Pb+2OH=Pb(OH)2