Question

$2\,gm$ of metal carbonate is neutralized completely by $100 \,mL$ of $0.1 \,(N) \,HCl$. The equivalent weight of metal carbonate is

• A. $50$
• B. $100$
• C. $150$
• D. $200$

Answer 1

Answer: (D)

$200$

Answer 2

As $2 \,g$ of metal carbonate is neutralised by $100\, mL$ of $0.1 \,N \,HCl$.
$\because$ Number of gram-equivalents of $HCl$
$=\frac{100 \times 0.1}{1000}=0.01$
$\therefore$ Number of gram-equivalents of metal carbonate $=0.01$
Mass of $0.01$ gram equivalent metal carbonate $=2 \,g$
Mass of $1$ gram equivalent metal carbonate
$=\frac{2}{0.01} =200\, g$
$\therefore$ Equivalent mass of metal carbonate $=200$