KOH+H2SO4--->
Ca(OH)2+HCL--->
Al(OH)3+ H2SO4--->
2KOH+H2SO4=K2SO4+2H2O Ca(OH)2+2HCl=CaCl2+2H2O 2Al(OH)3+3H2SO4=Al2(SO4)3+6H2O