To 120 g of a nitric acid solution with a mass fraction of 25%, 56 ml of nitric acid with a density of 0.91

| September 21, 2021 | education

To 120 g of a nitric acid solution with a mass fraction of 25%, 56 ml of nitric acid with a density of 0.91 and a mass fraction of 17% was added. Find the mass fraction of the final solution?

1. Find the mass of nitric acid in the first solution:

m1 (HNO3) = m1 (solution) * ω1 (HNO3) / 100% = 120 g * 25% / 100% = 30 g.

2. Find the mass of nitric acid in the second solution:

m2 (solution) = V2 (solution) * ρ2 (solution) = 56 ml * 0.91 g / ml = 50.96 g.

m2 (HNO3) = m2 (solution) * ω2 (HNO3) / 100% = 50.96 g * 17% / 100% = 8.66 g.

3. Find the total mass of nitric acid:

m (HNO3) = m1 (HNO3) + m2 (HNO3) = 30 g + 8.66 g = 38.66 g.

4. Let’s find the total mass of solutions and the mass fraction of nitric acid in it:

m (solution) = m1 (solution) + m2 (solution) = 120 g + 50.96 g = 170.96 g.

ω (HNO3) = m (HNO3) / m (solution) * 100% = 38.66 g / 170.96 g * 100% = 22.61%.

Answer: ω (HNO3) = 22.61%.



One of the components of a person's success in our time is receiving modern high-quality education, mastering the knowledge, skills and abilities necessary for life in society. A person today needs to study almost all his life, mastering everything new and new, acquiring the necessary professional qualities.