J.R. S. answered 10/07/21
Ph.D. University Professor with 10+ years Tutoring Experience
Since both reactants are aqueous (aq), and the product KCN is aqueous and all are strong electrolytes (ionize completely), the only species that we need to be concerned with is the liquid H2O(l). This is true for many acid/base reactions where the products are a salt and water.
H+(aq) + OH-(aq) ==> H2O(l) ... NET IONIC EQUATION