Question

Complete and balance the equations, predict solubilities, and write complete ionic equations for the following: (see attached image)

4. Complete and balance the equations, predict solubilities and write complete ionic equations for the following: (c) K2Co BaCl2 (d) NaoH H3PO4

Answer 1

4.

(c)

K₂CO₃ + BaCl₂ $\rightarrow$ KCl + BaCO₃

Balancing the equation, we get

K₂CO₃ + BaCl₂ $\rightarrow$ ​ 2KCl + BaCO₃

Four relevant ions are Ba⁺², Cl^-, K⁺ and CO₃^-2

Two products will be BaCO3(s) and KCl(aq)

BaCl2 + K2CO3 $\rightarrow$ BaCO3 + 2KCl

BaCl2(aq) + K2CO3(aq) $\rightarrow$ BaCO3(s) + 2KCl(aq) the barium carbonate is the precipitate

Ba⁺² + 2Cl^- + 2K⁺ + CO₃^-2 $\rightarrow$ BaCO₃ + 2K⁺ + 2Cl^-

Ba⁺²(aq) + CO₃^-2(aq) $\rightarrow$ BaCO₃(s)

(d)

NaOH + H₃PO₄ $\rightarrow$ Na₃PO₄ + 3 H₂O

Balancing each atoms on both sides, we get the balanced equation as

3NaOH(aq) + H₃PO₄(aq) $\rightarrow$ Na₃PO₄(aq) + 3 H₂O(l)

3Na⁺(aq) + 3OH^-(aq) + 3H⁺(aq) + PO₄^3-(aq) $\rightarrow$ 3Na⁺(aq) + PO₄^3-(aq)  + 3 H₂O (l)

3OH^-(aq)  + 3H⁺(aq)   $\rightarrow$   3 H₂O(l)

OH^-(aq)  + H⁺(aq) $\rightarrow$   H₂O(l)