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Q.

The solubility of substance X in pure ethanol is 0. 1 g/L and in water is To dissolve 1/ g of dry X we are adding of fresh 50% (V/V) ethanol solution in each
time on X. How many times we are to add this ethanol solution to dissolve X?

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a

100

b

106

c

103

d

104

answer is D.

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Detailed Solution

Each time we are adding 20 ml ethanol solution.
In 20 ml ethanol solution vol. C2H5OH = 10 ml and vol. of water - 10 ml .

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The solubility of substance X in pure ethanol is 0. 1 g/L and in water is To dissolve 1/ g of dry X we are adding of fresh 50% (V/V) ethanol solution in eachtime on X. How many times we are to add this ethanol solution to dissolve X?