3) Na₂S +2 HCl= 2NaCl+H₂S↑
2H⁺+S²⁻ =H₂S↑
2 Ag⁺ +CO₃²⁻ = Ag₂CO₃↓
2AgNo₃+ Na₂CO₃ =Ag₂CO₃↓ + 2 NaNO₃
2Ag⁺ + 2NO₃⁻ + 2Na⁺ + CO₃²⁻ = Ag₂CO₃↓ + 2Na⁺ + 2NO₃⁻
2) 3Ba(OH)₂+2Na₃PO₄=Ba₃(PO₄)₂↓ +6NaOH
3Ba²⁺ + 2PO₄³⁻ →Ba₃(PO₄)₂↓
Ba(OH)₂ + CuO≠
Ba (OH)₂ + 2HCl= BaCl₂ +2H₂O
2OH⁻ + 2H⁺ =2H₂O
Ba(OH)₂ +Zn(NO₃)₂ =Ba(NO₃)₂ +2HNO₃
Ba(OH)₂ +SO₂≠
Ba(OH)₂ +2NaBr =BaBr₂+2NaOH