4.1) An acid, H₂A, reacts with sodium hydroxide as shown in the equation below.
H₂A(aq) + 2NaOH(aq) → 2Na*(aq) + A²- (aq) + 2H₂O(1)
A solution of this acid was prepared by dissolving 2.02 g of H₂A in water and making the volume up to 250
cm³ in a volumetric flask.
A 25.0 cm³ sample of this solution required 22.80 cm³ of 0.150 mol dm3 aqueous NaOH for complete
reaction. Calculate the relative molecular mass, Mr, of H₂A
