Question

How many grams of dibasic acid (Mol.wt.=200) should be present in 100ml of its aqueous solution to give deci normal strength?

• A. $1g$
• B. $2g$
• C. $10g$
• D. $20g$

Answer 1

Answer: (A)

$1g$

Molarity of dibasic acid

$M=\frac{\omega }{200}\times \frac{1000}{100}$

$N=M\times 2\to$ dibasic acid

$\frac{1}{10}=\frac{\omega }{200}\times \frac{1000}{100}\times 2$

$\omega =\frac{1000}{1000}$

$\omega =1gm$

So, the correct option is $A$