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  4. How many grams of concentrated nitric acid solution should be used to prepare 250 mL of 2.0 M HNO 3 ? The concentrated acid is 70 % HNO 3 :

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Q. How many grams of concentrated nitric acid solution should be used to prepare $250\, mL$ of $2.0 M HNO _3$ ? The concentrated acid is $70 \% HNO _3$ :

Some Basic Concepts of Chemistry

Solution:

Molarity $=\frac{ W \times 1000}{\text { Mol. } wt . \times V _{\text {sol }( mL )}} \Rightarrow 2=\frac{ W }{63} \times \frac{1000}{250}$
$W=\frac{63}{2} g $
Mass of acid $\times \frac{70}{100}=\frac{63}{2}$
Mass of acid $=45 g$