25 cm $^{3}$ of 0.5 mol/dm $^{3}$ sodium hydroxide solution is neutralised by sulfuric acid of concentration 0.4 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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25 cm 3 of 0.5 mol/dm 3 sodium hydroxide… | HKDSE (Hong Kong)