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Question 6

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

Mass of nitric acid solution = 69 g (because 69% means 69 g dissolved in 100 ml of solvent)

 

Density of nitric acid solution = 1.41 g/ml

 

Volume of nitric acid solution = mass/density= 100/1.41 = 70.92 ml

 

No of moles of nitric acid = mass of nitric acid/molar mass of nitric acid=69/63= 1.09

 

Volume of the solution = 70.92

 

Molarity of the solution = moles of nitric acid/volume of solution in litres

 

= 1.09*1000/70.92= 15.37 moles/liter

 

∴Concentration of nitric acid = 15.37 mol/L

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