J.R. S. answered 03/24/20
Ph.D. University Professor with 10+ years Tutoring Experience
Since HClO2 is a weak acid, we do not ionize it, so it appears as it is. NaOH is a strong base and will dissociate completely, so we show these as ions. H2O is a liquid, so we leave it as is, and NaClO2 is a soluble salt, so again, we can dissociate it into it's ions. Thus, we have the following complete ionic equation..
HClO2(aq) + Na+(aq) + OH-(aq) ==> H2O(l) + Na+(aq) + ClO2-(aq)
Canceling spectator ions, we end up with the following net ionic equation...
HClO2(aq) + OH- ==> H2O(l) + ClO2-(aq)