An aqueous solution of hydrocyanic acid, HCN( a q ) , reacts with an aqueous sol

Question

An aqueous solution of hydrocyanic acid, HCN(aq) , reacts with an aqueous solution of NaOH .

Unlike strong acids, when a weak acid like HCN(aq) is dissolved in water the ions stick together; they do not ionize completely. To indicate a weak acid in solution, we just write the reagent as HCN(aq) to denote that it is dissolved, but not dissociated.

1) Write the complete ionic equation for the acid-base neutralization that occurs. [Hint: CN(aq) ion is present in the neutralized solution.]

2) What salt would remain behind if you evaporated the water from the neutralized solution?

Explanation / Answer

balanced equation :

HCN (aq) + NaOH   ----------------> NaCN + H2O

1)

complete ionic equation :

HCN + OH-   ------------------> CN-   + H2O (l)

2)

the salt remain is NaCN .

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