To a solution of sulfuric acid weighing 250 g with a mass fraction of H2SO4 equal to 0.120 was

| May 9, 2021 | education

To a solution of sulfuric acid weighing 250 g with a mass fraction of H2SO4 equal to 0.120 was added another solution of the same acid weighing 150 g with a mass fraction of H2SO4 equal to 18.0%. determine the mass fraction of acid in the resulting solution.

1.Let’s find the mass of sulfuric acid in the first solution.

The mass fraction of a substance is determined by the formula:

W = m (substance): m (solution) × 100%,

hence m (substance) = (m (solution) × w): 100%.

m (substance) 1 = (250 g × 12%): 100% = 30 g.

2. Find the mass of sulfuric acid in the second solution.

m (substance) 2 = (150 g × 18%): 100% = 27 g.

3. Find the mass of the resulting solution.

m (solution) 3 = m1 (solution) + m2 (solution).

m (solution) 3 = 250 g + 150 g = 400 g.

4. Let’s find the mass fraction of sulfuric acid in the resulting solution.

m (substances) 3 = m1 + m2.

m (substance) 3 = 27 g + 30 g = 57 g.

W = (57g: 400g) × 100% = 14.25%.

Answer: 14.25%.



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