When aqueous solutions of sodium cyanide and hydrobromic acid are mixed, an aqueous solution of sodium bromide and hydrocyanic acid results. Write the net ionic equation for the reaction.

CN⁻ (aq) + H⁺ (aq) → HCN (l)

Explanation:

The reactants are aqueous solutions:

NaCN (aq) and HBr (aq)

When you mix these compounds you make pure HCN (l)

The molecular equation is:

NaCN (aq) + HBr (aq) → NaBr (aq) + HCN (l)

When you dissociate the reactants, you have:

Na⁺ (aq) + CN⁻ (aq) + H⁺ (aq) + Br⁻ (aq) → Na⁺ (aq) + Br⁻ (aq) + HCN (l)

Sodium bromide, it is a salt, that can also be dissociated in the solution

To make, the net ionic equation you remove the repeated ions

CN⁻ (aq) + H⁺ (aq) → HCN (l)