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.