question_answer 16)

 Concentrated nitric acid used in the laboratory work is 68% nitric acid by mass in aqueous solution. What should be the molarity of such a sample of the acid if the density of the solutions is 1.504 g mL–1?

Answer:

68 g of HNO3 is present in 100 g solution.  Volume of 100 g of solution = 0.0665L    Number of moels of HNO3  = 1.079 mol    Molarity of HNO3