1)
Na₂CO₃+Zn≠
Na₂CO₃+2H₃PO₄=2Na₃PO₄+3H₂O+3CO₂↑
Na₂CO₃+NaOH≠
2)
CuCl₂+Zn=ZnCl₂+Cu↓
3CuCl₂+2H₃PO₄=Cu₃(PO₄)₂↓+6HCl
CuCl₂+2NaOH=2NaCl+Cu(OH)₂↓
3)
Ba(NO₃)₂+Zn≠
3Ba(NO₃)₂+2H₃PO₄=Ba₃(PO₄)₂+6HNO₃
Ba(NO₃)₂+NaOH≠
4)
Al(OH)₃+Zn≠
Al(OH)₃+H₃PO₄=AlPO₄+3H₂O
Al(OH)₃+NaOH=Na[Al(OH)₄]