WAEC Chemistry 2025 Theory — Question 27

Question 27 of 70 from the West African Examinations Council (WAEC) Chemistry 2025 Theory paper, with the correct answer and a full explanation.

2(d)(ii). Calculate the volume of 0.10 mol dm-3 KOH required to neutralize 12.50cm3 of 0.10 mol dm-3 H2SO4.

Model answer

Using CaVa/CbVb = na/nb, where na = 1 (KOH), nb = 2 (H2SO4), Ca = 0.1 mol/dm3, Va = 12.50 cm3, Cb = 0.1 mol/dm3: Vb = (Ca x Va x nb)/(na x Cb) = (0.1 x 12.50 x 2)/(1 x 0.1) = 25.0 cm3.

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