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Question

How many grams of solute should be added in 100g water to get a solution of density 1.2g/ml and strength 5% (w/v)?

A
5g
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B
6g
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C
4.17g
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D
4.35g
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Solution

The correct option is D 4.17g
5% (w/v), by definition, means 5 grams of solute per 100 grams of solution.
Since the density is 1.2 g/ml, you can find the volume of 100 grams of solution.
100gsolution×1ml1.2g=83.33ml.
Hence
83.33ml×5g100ml=4.17g solute needed.

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