Some amount of dichloromethane is added to 671.141 mL of chloroform to prepare M solution of (DCM). The concentration of DCM is ______ ppm (by mass). Given: atomic mass: C = 12, H = 1, Cl = 35.5; density of = 1.49 g . [2023]

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Solution

Q.
Some amount of dichloromethane $({CH}_{2} {Cl}_{2})$ is added to 671.141 mL of chloroform $({CHCl}_{3})$ to prepare $2.6 \times 10^{- 3}$ M solution of ${CH}_{2} {Cl}_{2}$ (DCM). The concentration of DCM is ______ ppm (by mass). Given: atomic mass: C = 12, H = 1, Cl = 35.5; density of ${CHCl}_{3}$ = 1.49 g ${cm}^{- 3}$ . [2023]

Ans.
(148)

$Molarity = \frac{W \times 1000}{M_{w} \times V}$

$2.6 \times 10^{- 3} = \frac{W \times 1000}{85 \times 671.141}$

$W = \frac{2.6 \times 10^{- 3} \times 85 \times 671.141}{1000} = 0.148 g$

${Conc}^{n} . of DCM (in ppm) = \frac{0.148}{1.49 \times 671.141} \times 10^{6} = 148 ppm$

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