3. P2O5+3H2O=2H3PO4 H3PO4+3NaOH=Na3PO4+3H2O 2. SO3+H2O=H2SO4H2SO4+NaOH= Na2SO4+H2ONa2SO4+BaCl2=BaSO4+2NaCl
2)Cu(OH)2=CuO+H2O
3)CuO+2HCl=CuCl2+H2O
4)CuCl+H2S=
3. P2O5+3H2O=2H3PO4
H3PO4+3NaOH=Na3PO4+3H2O
2. SO3+H2O=H2SO4
H2SO4+NaOH= Na2SO4+H2O
Na2SO4+BaCl2=BaSO4+2NaCl