K2S+HCl= Na2CO3+H2SO4= NISO4+NaOH= FeCl+KOH=
K2S+HCl=KCl+H2S Na2CO3+H2SO4=Na2SO4+CO2+H2O NISO4+2NaOH=Ni(OH)2+Na2SO4 FeCl+2KOH=Fe(OH)2+2KCl