JAMB Chemistry 2020 Objective — Question 3

Question 3 of 40 from the Joint Admissions and Matriculation Board (JAMB) Chemistry 2020 Objective paper, with the correct answer and a full explanation.

3. 50cm3 of 0.1moldm-3 AgNO3 and 50cm3 of 0.1moldm-3 CaCl2 solutions are mixed. Assuming that AgCl is completely insoluble, calculate the mass of AgCl formed in this process

A. A. 0.98g
B. B. 1.43g
C. C. 0.72gCorrect
D. D. 0.36g

Explanation

2AgNO3+CaCl2 -> 2AgCl+Ca(NO3)2. n(AgNO3)=0.005mol, n(CaCl2)=0.005mol needs 0.01mol AgNO3, so AgNO3 is limiting. n(AgCl)=n(AgNO3)=0.005mol. Mass=0.005x143.5=0.72g.

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