How many milliliters of 0.50M NaOH solution are required to titrate 20.0mL of a 0.20M H2SO4 solution to an end point?

Answer 1

2NaOH + H2SO4 ==> Na2SO4 + 2H2O
mols H2SO4 = M x L = ?
mols NaOH = twice that
M NaOH = mols NaOH/L NaOH. You know M and mols, solve for L and convert to mL.