Final answer:
The net ionic equation for the reaction is HNO2 + OH- → NO2- + H2O. The hydroxide ion from sodium hydroxide reacts with the hydrogen ion from nitrous acid to form water.
Step-by-step explanation:
The net ionic equation for the reaction that occurs during the titration of nitrous acid with sodium hydroxide is (e) HNO2 + OH- → NO2- + H2O.
The hydroxide ion from sodium hydroxide reacts with the hydrogen ion from nitrous acid to form water, while the nitrite ion is the other product. This reaction is slightly basic and not neutral.