Question

1.0 g of a monobasic acid when completely acted upon $Mg$ gave 1.301 g of anhydrous $Mg$ salt. The equivalent weight of the acid is:

• A. 35.54
• B. 36.54
• C. 17.77
• D. 18.27

Answer 1

The correct option is B 36.54

$Mg+2HCl\to {MgCl}_2+H_2$

$\frac{E_{w}ofacid}{E_{w}ofsalt}=\frac{weightofacid}{weightofsalt}$

Let $E_w$ of acid $=E_w$ of $H$ $+$ $E_w$ of radical

$E_w$ of salt $=E_w$ of $Mg$ $+$ $E_w$ of radical

$\frac{1+E}{12+E}=\frac{1.0}{1.301}$

$\therefore E=35.54$

$\therefore E_w$ of acid $=1+E=36.54$