The reaction between sodium hydroxide NaOH and sulfuric acid H2SO4 is an acid-base reaction, also known as a neutralization reaction. The products of this reaction are sodium sulfate Na2SO4 and water H2O . The balanced chemical equation for this reaction is:2 NaOH + H2SO4 Na2SO4 + 2 H2OIn this reaction, the spectator ions are the sodium Na+ and sulfate SO4 2- ions. These ions do not participate in the reaction and remain unchanged in the solution.