Question

To dissolve 0.9 g metal, 100 mL of 1 N HCl is used. What is the equivalent weight of metal?

• A. 7
• B. 9
• C. 10
• D. 6

Answer 1

Answer: (B)

1 N HCI solution means; 36.5 g of HCI are dissolved in 1000 mL. ($\because$ Equivalent wt. of HCI = 36.5)
$\therefore$ 100 mL of HCl solution contains HCl = 3.65 g
Similarly, 100 mL of HCl solution contains metal = 0.9 g
Now ,
$\frac{eq.wt.ofmetal}{weightofmetalinsolution}=\frac{eq.wt.ofacid}{weightofacidinsolution}$
or $\frac{eq.wt.ofmetal}{0.9}=\frac{36.5}{3.65}$
or Eq. wt. of metal = $\frac{36.5}{3.65}\times 0.9=9$