Question

Concentrated HNO3 is 63% HNO3 by mass and has a density of 1.4 g/ml. How many milliliters of this solution
are required to prepare 250 ml. of 1.20 M HNO3 solution?

Answer 1

Explanation:

250ml of 1.2M solution contains

250/1000 x 1.2 = 0.3 moles of HNO3

Molar mass of HNO3 = 1 + 14 + 16x3 = 63 g/mol

0.3 moles of HNO3 has a mass of = 0.3 x 63 = 18.8 g

The original solution has a density of 1.4 g/ml

63% of this mass is that of HNO3

Mass of HNO3 in 1 ml of the original solution = 63/100 x 1

                                                                         = 0.63g

The volume of the solution that will contain 18.8g = 18.8/0.63 = 29.84 ml

Therefore, 29.84 ml of the original solution will be required to make 250ml of

Therefore, 29.84 ml of the original solution will be required to make 250ml of1.20M HNO3 solution

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