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Some Basic Concepts of Chemistry
Question
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Calculate the concentration of nitric acid in moles per litre in a sample which has a density, 1.41 g mL–1 and the mass per cent of nitric acid in it being 69%.

Answer

We have given,

Mass percent of nitric acid in the sample =69%

Thus, 100g of nitric acid contains 69g of nitric acid by mass.

Molar mass of nitric acid contains 69g of nitric acid by mass.

Molar mass of nitric acid (HNO3­)

=[1+14+3(16)]

=1+14+48

=63g mol-1

Therefore, number of moles in 69g of HNO3

= 69g/63g mol-1

=1.095 mol

Volume of 100g of nitric acid solution =

=Mass of solution/density of solution

= 100/1.41g ML-1

=70.92mL =70.92 x10-3L

Concentration of nitric acid

=1.095mole/70.92 mol L-1

Thus,

Concentration of nitric acid =15.44 mol/L

 

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