Question

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

• A. $0.14$
• B. $0.28$
• C. $0.35$
• D. $0.07$

Answer 1

The correct option is D $0.07$

$25$ ml of barium hydroxide solution requires $35$ ml of $0.1M$ (or $0.1N$ ) $HCl$ solution.

First we calculate the normality of the solution using the formula given below:

$N_1\times V_1=N_2\times V_2$

$25\times N_1=0.1\times 35$

$N_1=0.14N$.

$1$ mole of barium hydroxide reacts with $2$ moles of $HCl$.

Hence, the molarity of barium hydroxide is one half its normality.

It is equal to $\frac{0.14}{2}$ or $0.07M$.

Hence, the correct option is $D$