Question

calculate the concentration of nitric acid in moles per litre in a sample which has a density 1.41 gram per ml and mass percent of nitric acid in it being 69% ​

Answer 1

Explanation:

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