The balanced neutralization reaction between H2SO4 and KOH in aqueous solution is:

H2SO4(aq) + 2KOH(aq) → K2SO4(aq) + 2H2O(l)

In this reaction, H2SO4, a strong acid, reacts with KOH, a strong base, to produce K2SO4, a salt, and water. The reaction is complete when the moles of H2SO4 and KOH are equal.