HNO3+CaO=Ca(NO3)2+H2O

2HCl+2Ag=2AgCl+H2

HBr+AgCl=AgBr+HCl

HI+KOH=KI+H2O

2HF+Na2O=2NaF+H2O

H3PO4+3NaOH=Na3PO4+3H2O

H2S+CuO=CuS+H2O

H2SO3+Na2O=Na2SO3+H2O

H2CO3+ZnO=ZnCO3+H2O

H2SiO3+BeO=BeSiO3+H2O