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Solids in Liquids

Solubility of...

Question

Solubility of a solute is $S$ . Find its percentage by weight.

\frac{200 S}{S + 100}

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\frac{50 S}{S + 100}

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\frac{100 S}{S + 100}

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None of these

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Solution

The correct option is C $\frac{100 S}{S + 100}$
Solubility of solute is S means that
S grams per 100g solvent.
So weight of solution $= (S + 100)$ grams
weight % $= \frac{w e i g h t o f s o l u t e}{w e i g h t o f s o l u t i o n} \times 100$
$= \frac{100 S}{5 + 100}$

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