An aqueous solution of $NaOH$ has a molarity of 0.05M. Select the option having an incorrect representation of the concentration of a solution.
$[d_{solution} = 1.002 g m / m l]$ .

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$p p m = 5 p p m NaOH$ solution

$% w / w = \frac{2}{10.02} %$

$X_{NaOH} (Mole fraction) = \frac{0.05}{0.05 + 55.56}$

$% w / v = 0.2 %$

answer is D.

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Detailed Solution

Given,

Molarity of aqueous solution of sodium hydroxide = 0.05 M

The weight per unit volume is obtained as 0.2 percent while the mole fraction is obtained as,

$X_{NaOH} (Mole fraction) = \frac{0.05}{0.05 + 55.56}$

The percentage weight per unit mass is,

$% w / w = \frac{2}{10.02} %$

All the given relations are correct while the relation D is incorrect.

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