Question

25 ml of a solution of barium hydroxide on titration with a 0.1 molar solution of hydrochloric acid gave a titre value of 35 ml. The molarity of barium hydroxide solution was

(a) 0.07

(b) 0.14

(c) 0.28

(d) 0.35

Answer 1

Correct option is (a) 0.07

Let the molarity of Ba(OH)₂ solution be k M.

n-factor × M₁V₁ = n - factor × M₂V₂

2 × k × 25 = 1 × 0.1 × 35 (Since n-factor of Ba(OH)₂ = 2 and of HCl = 1)

Molarity of Ba(OH)₂ solution = 0.07 M