JAMB Chemistry 2008 Objective — Question 20

Question 20 of 50 from the Joint Admissions and Matriculation Board (JAMB) Chemistry 2008 Objective paper, with the correct answer and a full explanation.

0.05mol dm3 HCl is neutralized by 25cm3 NaOH. If the volume of acid used is 32.00cm3, what is the concentration of the base?

A. 0.016mol dm3
B. 0.032mol dm3
C. 0.039mol dm3
D. 0.064mol dm3Correct

Explanation

CaVa/na = CbVb/nb. Ca=0.05moldm-3, Va=32.00cm3, na=1, Ca=? Vb=25cm3, nb=1. Cb=(0.05x32x1)/(25x1) = 0.064moldm-3.

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