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

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

MP PMTMP PMT 2010Some Basic Concepts of Chemistry

Solution:

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