how many mL of a 0.20M KOH solution is needed to neutralize 25 mL of 0.25 M H2SO4?

Answer 1

H2SO4 + 2NaOH ==>Na2SO4 + 2H2O
mols H2SO4 = M x L = ??
Look at the coefficients in the balanced equation. mols NaOH = 2 x mole H2SO4.
Then M NaOH = moles NaOH/L NaOH
You know M and you know moles, solve for L NaOH and convert to mL.