20 cm $^{3}$ of 0.2 mol/dm $^{3}$ sodium hydroxide solution is neutralised by sulfuric acid of concentration 0.2 mol/dm $^{3}$ according to 2NaOH + H $_{2}$ SO $_{4}$ → Na $_{2}$ SO $_{4}$ + 2H $_{2}$ O. What volume of the acid is needed?

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