Calculate the concentration of nitric acid in moles per litre In a sam – InterviewSolution

1.

Calculate the concentration of nitric acid in moles per litre In a sample which has a density 1.41 L^-1and mass percent of nitric acid in it being 69%.

Answer»

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Concentration of nitric acid in moles/litre = $\bold{15.44\:M}$

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Mass percent of nitric acid is 69%. This means that 100 G of nitric acid solution CONTAINS 69 g of nitric acid by mass.
Density of the sample = $\bold{1.41\:gL^{-1}}$

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Concentration of $\bold{HNO_3}$ in moles/litre in the sample.

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No. of moles in 69 g $\bold{HNO_3=\frac{Mass}{Molar\:mass}}$

$\bold{\implies\dfrac{69}{63}=1.095\:mol}$

Volume of 100 g $\bold{HNO_3}$ solution

$\bold{=\frac{Mass}{Density}=\frac{100}{1.41}}$

$\implies\bold{70.92\:mL}$

$\implies\bold{0.07092\:L}$

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∴ Concentration of $\bold{HNO_3}$ in moles/litre

$\implies\bold{\dfrac{n}{v}=\dfrac{1.095}{0.07092}}$

$\implies\bold{15.44\:M}$

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