Question

Hydrochloric acid solutions A and B have concentration of 0.5 N and 0.1 N respectively. The volume of solutions A and B required to make 2 litres of 0.2 N hydrochloric are

(a) 0.5 l of A + 1.5 l of B

(b) 1.5 l of A + 0.5 l of B

(c) 1.0 l of A + 1.0 l of B

(d) 0.75 l of A + 1.25 l of B

Answer 1

Correct option is (a) 0.5 l of A + 1.5 l of B

Let x l of solution be required. Then

0.5x + 0.1(2 - x) = 0.1 \(\times\) 2 , or x = 0.5 l

Volume of solution B = 2 - 0.5 = 1.5 l