H2SO4+K2S=K2SO4+H2S H2SO4+2KOH=K2SO4+H2O 2Fe(OH)3 +3H2SO4=Fe2 (SO4)3 +6H2O Al(OH)3+3HCl=AlCl3+3H2O K2SO4+Pb(NO3)2= 2KNO3+PbSO4 HCl+KOH=KCL+H2O Zn(OH)2+2HNO3=Zn(NO3)2+2H2O 2AgCl+PbI2=2AgI+PbCl2