1. Na2CO3+2HCl=2NaCl+H2O+CO2↑
(2Na^+ )+ (CO3^2)+(2H^+)+(2Cl^-)= (2Na^+)+(2Cl^-)+H2O+CO2↑
(2H^+)+(CO3^2-)=H2O+CO2↑
2. CaCl2+Na2SO4=2NaCl+CaSO4↓
(Ca^2+)+(2Cl^-)+(2Na^+)+(SO4^2-)=(2Na^+) + (2Cl^-) + CaSO4↓
(Ca^2+) + (SO4^2-)= CaSO4↓
3. CuSO4+2KOH=Cu(OH)2↓+K2SO4
(Cu^2+) + (SO4^2-) + (2K^+) + (2OH^-) = Cu(OH)2↓+(2K^+) + (SO4^2-)
(Cu^2+) + (2K^+) + (2OH^–) = Cu(OH)2↓
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Answers & Comments
1. Na2CO3+2HCl=2NaCl+H2O+CO2↑
(2Na^+ )+ (CO3^2)+(2H^+)+(2Cl^-)= (2Na^+)+(2Cl^-)+H2O+CO2↑
(2H^+)+(CO3^2-)=H2O+CO2↑
2. CaCl2+Na2SO4=2NaCl+CaSO4↓
(Ca^2+)+(2Cl^-)+(2Na^+)+(SO4^2-)=(2Na^+) + (2Cl^-) + CaSO4↓
(Ca^2+) + (SO4^2-)= CaSO4↓
3. CuSO4+2KOH=Cu(OH)2↓+K2SO4
(Cu^2+) + (SO4^2-) + (2K^+) + (2OH^-) = Cu(OH)2↓+(2K^+) + (SO4^2-)
(Cu^2+) + (2K^+) + (2OH^–) = Cu(OH)2↓