What is the mass fraction of the solution in the resulting addition of 80 g of water to 120 g of a 60% solution?
| March 27, 2021 | education
The mass fraction of a substance in a solution is defined as the ratio of the mass of the solute to the mass of the solution. When the solution is diluted, the mass of the solution changes, but the mass of the soluble substance remains unchanged.
To solve the problem, we need to first determine the mass of the dissolved compound, then calculate the mass of the solution after dilution, and only then calculate the new concentration.
m (in-va) = 120 * 60/100 = 72 g of solute.
m (solution) = 120 + 80 = 200 g of solution after dilution.
ω = 100 * 72/200 = 36% new mass fraction.
Answer: the mass fraction is 36%.
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