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)

9

Answer 2

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 , $\frac{e wt.of \, metal}{weight \, of \, metal \, in \, solution} = \frac{ewt. of \, acid}{weight \,of \, acid \, in\, solution}$ or $\frac{ewt. of \, metal}{0.9} = \frac{36.5}{3.65}$ or E wt. of metal = $\frac{36.5}{3.65} \times 0.9 = 9$