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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 $70 \% HNO _3$

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Solution:

Molarity $( M )=\frac{\text { wt } \times 1000}{\text { mol. wt. } \times \text { vol }( mL )}$
$2=\frac{w t .}{63} \times \frac{1000}{250}$
$wt .=\frac{63}{2} g =31.5\, g$
wt. of $70 \%$ acid $=\frac{100}{70} \times 31.5=45\, g$