How will the concentration of the solution change if 20 ml of water has been evaporated from 85 g of 15%?

univerkov | May 29, 2021 | education

Given: m1 = 85 g; m2 = 65 g; W1 = 15%. Find W2
We consider the mass of the substance in the original solution: m (substance) = 85 * 15/100 = 12.75 g.
Knowing the mass of the substance in the original solution, we can find its mass fraction in the evaporated solution:
W2 = (12.75 / 65) * 100 = 19.615%
Answer: the evaporated solution contains 19.615% of the substance.

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