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Q.

Concentrated HNO3 is 63% HNO3 by mass and has a density of 1.4 g/ml. How many milli litres of this solution are required to prepare 250 mL of a 1.20 M HNO3 solution?

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a

18.0

b

14.21

c

20.0

d

21.42

answer is B.

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Detailed Solution

m-moles of HNO3 required = 250×1.2 = 300 ∴ molarity of HNO3 solution =63×10×1.4/63=14 ⇒14×V=300 (or) V=21.42ml

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