Q.

A solution contains 75 mg NaCl per mL. To what extent must it be diluted to give a solution of concentration 15 mg NaCl per mL of solution.

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answer is 5.

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Detailed Solution

The concentration is reduced to 1/5th ,without any change in the number of g of solute, hence the volume must increase five fold. Dilute it to 5.0 times its former volume.
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Get ₹ 1 crore* worth scholarship for JEE / NEET / Foundation
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Best Books for NEET
How to Join IIT after 10th
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