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 ______.

पर्याय

• 0.07

• 0.14

• 0.28

• 0.35

Answer 1

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 0.07.

Explanation:

Given: Volume of Ba(OH)₂ solution = 25 mL

Volume of HCl used = 35 mL

Molarity of HCl = 0.1 M

Reaction:

\[\ce{Ba(OH)2 + 2HCl −> BaCl2 + 2H2O}\]

Milliequivalents of acid = Milliequivalents of base

N₁V₁ = N₂V₂

For HCl:

N₁ = 0.1 N, V₁ = 35 mL

For Ba(OH)₂:

Let N₂ = ?, V₂ = 25 mL

0.1 × 35 = N₂​ × 25

`N_2 = 3.5/25 = 0.14`

Ba(OH)₂ gives 2OH⁻ ions ⇒ Basicity = 2

`M = N/2`

= `0.14/2`

M = 0.07 M