Question

When 5.0 g of salt are added to a sample of pure water, the resulting concentration is 20 %. Calculate the mass of pure water used.​

Answer 1

Answer:

20 g

Explanation:

concentration = 20%

so, mass of solute/mass of solution = 20/100 = 0.2

so, 5/mass of solution = 0.2

so, mass of solution = 25 g

so, mass of solute + mass of solvent = 25 g

so, mass of solvent = 25 - 5 g

so, mass of solvent = 20 g

so, mass of water = 20g