Question

wConcentration of CHCl3 is 10 ppm.The %(w/w) will be
(A) 10-3%(w/w)
(B) 8%(w/w)
(C) 10 %(w/w)
(D) 12%(w/w)​

Answer 1

Answer:

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(A) 10-3%(w/w)

Answer 2

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⭐ Concentration of CHCl3 is 10 ppm . Then the %(w/w) will be,

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• The concentration of chloroform = 10 ppm

∴ 10⁶ g of solution contains 10 g chloroform .

☕ Thus, 1000g of solution contains $\bf{\dfrac{10}{10^6}\:=\:10^{-5}\:g\: chloroform\:}$ .

We know that,

$\checkmark\:\bf\purple{\%\:by\:Mass\:(w/W)\:=\:\dfrac{Mass\:of\:solute}{Mass\:of\:solution}\times{100}\:}$

Where,

• Mass of Solute = $\bf{10^{-5}\:g.}$

• Mass of solution = 1000 g. = 1kg

$\implies\:\bf{\%\:by\:Mass\:(w/W)\:=\:\dfrac{10^{-5}}{1}\times{100}\:}$

$\implies\:\bf{\%\:by\:Mass\:(w/W)\:=\:{10^{-5}}\times{100}\:}$

$\implies\:\bf\red{\%\:by\:Mass\:(w/W)\:=\:{10^{-3}}\%}--(A)$