WAEC Chemistry 2010 Theory — Question 20

Question 20 of 46 from the West African Examinations Council (WAEC) Chemistry 2010 Theory paper, with the correct answer and a full explanation.

3b) Calculate the volume of a solution: Vc=?, Ca=0.5moldm⁻³, Vb=20cm³, Cb=0.3moldm⁻³, na=1, nb=1.

Model answer

Using the formula CaVa/CbVb = na/nb: Va = (CbVbna)/(Canb) = (0.3x20x1)/(0.5x1) = 12cm³.

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