Question

1..25 g of a solid dibasic acid is completely neutralised by 25 mL of 0.25 molar $Ba(OH{)}_2$ solution. Molecular mass of the acid is:

• A. 100
• B. 150
• C. 120
• D. 200

Answer 1

The correct option is D 200

As we know,

$M_1{U}_1\ast n_{f}1=M_2{V}_2\ast n_{f}2$

$n\ast 2=0.25\ast \frac{25}{1000}\ast 2$

$\frac{m}{n}\ast 2=0.25\ast \frac{25}{1000}\ast 2$

$\frac{1.25g}{M}\ast 2=0.25\ast \frac{25}{1000}\ast 2$

$M=200$ g