Question

Molecular and net ionic equations for

1) Ba^2+ + H2SO4

2) Sr^2+ + H2SO4

3) Ba^2+ + Na2CO3

4) Ca^2+ + Na2CO3

5) Mg^2+ + Na2CO3

6) Sr^2+ + Na2CO3

7) Ba^2+ + (NH4)2C2O4

8) Ca^2+ + (NH4)2C2O4

9) Sr^2+ + (NH4)2C2O4

10) Ba^ 2+ + K2CrO4

Answer 1

1) Ba²⁺ + H₂SO₄    BaSO4   

Ba²⁺ + 2H⁺ +   SO₄      BaSO4    + 2H+

Ba²⁺ + SO₄      BaSO4

2) Sr²⁺ + H₂SO₄      BaSO4 + 2H+

Sr²⁺  + 2H⁺   +   SO₄      SrSO4 + 2H+

Sr²⁺   +   SO₄      SrSO4

3) Ba²⁺ + Na2CO3

Na2CO3 is soluble in water and completely dissociated into Na+ and CO₃^2- ions. The Na⁺ ions are spectator ions. The only reaction is between Ba²⁺ and CO₃^2-.
Ba²⁺ + CO₃^2- BaCO₃(s)

4) Ca²⁺ + Na2CO3

Na2CO3 is soluble in water and completely dissociated into Na+ and CO₃^2- ions. The Na⁺ ions are spectator ions. The only reaction is between Ca²⁺ and CO₃^2-.
Ca²⁺ + CO₃^2- CaCO₃(s)

5) Mg²⁺ + Na2CO3

Na2CO3 is soluble in water and completely dissociated into Na+ and CO₃^2- ions. The Na⁺ ions are spectator ions. The only reaction is between Mg²⁺ and CO₃^2-.
Mg²⁺ + CO₃^2- CaCO₃(s)

6) Sr²⁺ + Na2CO3

Na2CO3 is soluble in water and completely dissociated into Na+ and CO₃^2- ions. The Na⁺ ions are spectator ions. The only reaction is between Sr²⁺ and CO₃^2-.
Sr²⁺ + CO₃^2- SrCO₃(s)

7) Ba²⁺ + (NH4)2C2O4

Ba²⁺(aq) + C₂O₄^2-(aq) BaC₂O₄(s)

8) Ca²⁺ +  (NH4)2C2O4

Ca²⁺(aq) + C₂O₄^2-(aq) CaC₂O₄(s)

9) Sr²⁺ +  (NH4)2C2O4

Sr²⁺(aq) + C₂O₄^2-(aq) SrC₂O₄(s)

10) Ba²⁺ + K2CrO4

In K2CrO4 you have K⁺ ions and CrO4^2- ions.

Ba²⁺(aq) with CrO4^2-(aq)   BaCrO4(s)