Determine how the mass fraction of sodium chloride in a 10% solution weighing 150 g

Determine how the mass fraction of sodium chloride in a 10% solution weighing 150 g will change if you add a) 50 g. salt b) 50g water

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

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

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

Find the mass of sodium chloride in a 10% solution.

m (substance) = (150 g × 10%): 100% = 15 g.

Find the mass of the substance after adding 50 g of salt.

m (substance) 2 = 15 g + 50 g = 65 g.

Let’s find how the mass fraction of a substance in a solution will change.

W = (65g: 150g) × 100% = 43.33%.

Find the mass of the solution after adding 50 g of water.

150 g + 50 g = 200 g.

Let’s find how the mass fraction of a substance in the resulting solution will change.

W = (15g: 200g) × 100% = 7.5%.

Answer: a) 43.33%; b) 7.5%.