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Q.

How many grams of concentrated Nitric acid should be used to prepare 250ml of 2.0M $H N O_{3}$ ? (Conc. $H N O_{3}$ is 70% $H N O_{3}$ )

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a

90.0 g of Conc. $H N O_{3}$

b

45.0g of Conc. $H N O_{3}$

c

70.0g of Conc. $H N O_{3}$

d

54.0g of Conc. $H N O_{3}$

answer is D.

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Detailed Solution

$M = \frac{W}{M^{1}} \times \frac{1000}{V}$

$2 = \frac{W}{63} \times \frac{1000}{250} = \frac{63}{2} g$

Wt of 70% acid $= \frac{100}{70} \times 3.15 = 45 g$

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