JAMB Chemistry 2020 Objective — Question 39

Question 39 of 40 from the Joint Admissions and Matriculation Board (JAMB) Chemistry 2020 Objective paper, with the correct answer and a full explanation.

39. If 24.83cm3 of 0.15moldm-3 NaOH is titrated to its end point with 39.45cm3 of HCl, the concentration of HCl in moldm-3 is

A. A. 0.094Correct
B. B. 1.5
C. C. 0.15
D. D. 0.94

Explanation

Moles NaOH = 0.15 x 0.02483 = 0.003725mol. For a 1:1 reaction with HCl, concentration of HCl = 0.003725/0.03945 ≈ 0.094moldm-3.

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