Question

1) Write the net ionic equation for the equilibrium that is established when ammonium iodide is dissolved in water. (Use H3O+ instead of H+.) This solution is acidic, basic or neutral?

2)Write the net ionic equation for the equilibrium that is established when calcium nitrite is dissolved in water. The solution is acidic, basic or neutral?

3)Write the net ionic equation for the equilibrium that is established when barium cyanide is dissolved in water. This solution is acidic, basic or neutral?

Answer 1

1. The molecular equation is given as

NH₄I (aq) + H₂O (l) -------> NH₄OH (aq) + HI (aq)

The solution produces a weak base (NH₄OH) and a strong acid (HI); hence, the solution is acidic.

2. The molecular equation is given as

Ca(NO₂)₂ (aq) + 2 H₂O (l) --------> Ca(OH)₂ (aq) + 2 HNO₂ (aq)

Ca(OH)₂ is a strong base and ionizes completely to produce OH^-. HNO₂ is a weak acid. Hence, the solution is basic.

3. The molecular equation for the dissolution reaction is given as

Ba(CN)₂ (aq) + 2 H₂O (l) --------> Ba(OH)₂ (aq) + 2 HCN (aq)

Ba(OH)₂ is a strong base while HCN is a weak acid; hence, the solution will be basic.