Question

The formula weight of an acid is $82$. In a titration, $100c{m}^3$ of a solution of this acid containing $39.0g$ of the acid per litre were completely neutralised by $95.0c{m}^3$ of aqueous $NaOH$ containing $40.0g$ of $NaOH$ per litre. What is the basicity of the acid?

Answer 1

Normality of $NaOH=1$
Normality of acid $=\frac{1\times 95}{100}-0.95$
Let the eq. mass of the acid be $E$.
$\therefore \frac{39}{E}=0.95$ or $E=41$; $Basicity=\frac{82}{41}=2$.