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Q.

The volume of water needs to be added to 10.0 mL of nitric acid (density : 1.40gmL1) ) containing 70 mass percent of acid to prepare 1.0 M solution would be

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a

130.6 mL

b

145.6 mL

c

120.6 mL

d

135.6 mL

answer is D.

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Detailed Solution

Mass of 10.0 mL of nitric acid, m=Vρ=(10.0mL)(1.40gmL1)=14.0g

Mass of nitric acid in this solution =(14.0g)(70/100)=9.8g

Amount of nitric acid, n=m/M=9.8g/63gmol1=0.1556mol

Molarity of solution M=nV=(0.1556mol0.01L)=15.56M

This solution is to be diluted to prepare 1.0 M solution.

Volume of the resultant solution  =(10mL)(15.56M)(1.0M)=155.6mL

Volume of water to be added =155.6mL10.0mL=145.6mL

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