Problem: Hydrocyanic acid has the formula HCN. Write a net ionic equation for the reaction of aqueous hydrocyanic acid and aqueous sodium hydroxide.a. HCN(aq) + NaOH(aq) → Na+(aq) + CN–(aq) + H2O(l)b. HCN(aq) + H2O(aq) → CN–(aq) + H3O+(aq)c. H3O+(aq) + OH–(aq) → 2H2O(l)d. HCN(aq) + OH–(aq) → CN–(aq) + H2O(l)e. H3O+(aq) + NaOH(aq) → Na+(aq) + 2H2O(l)

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We’re being asked to determine the net ionic equation when hydrocyanic acid reacts with sodium hydroxide


We’re going to determine the spectator ions using the following steps:

Step 1. Write the overall balanced reaction
Step 2. Write the total or full ionic equation
Step 3. Identify the spectator ions


Step 1. Write the overall balanced reaction

Reactants:

Hydrocyanic acid → weak acid → HCN (from cyanide CN-) → aqueous → will break up into its ions

▪ H+ → polyatomic ion
▪ CN- → polyatomic anion

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Problem Details

Hydrocyanic acid has the formula HCN. Write a net ionic equation for the reaction of aqueous hydrocyanic acid and aqueous sodium hydroxide.

a. HCN(aq) + NaOH(aq) → Na+(aq) + CN(aq) + H2O(l)

b. HCN(aq) + H2O(aq) → CN(aq) + H3O+(aq)

c. H3O+(aq) + OH(aq) → 2H2O(l)

d. HCN(aq) + OH(aq) → CN(aq) + H2O(l)

e. H3O+(aq) + NaOH(aq) → Na+(aq) + 2H2O(l)


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