From 400 g of a 20% salt solution, 100 g of water was removed by evaporation. What is the mass fraction
| April 2, 2021 | education
From 400 g of a 20% salt solution, 100 g of water was removed by evaporation. What is the mass fraction of salt in the resulting solution?
Let’s calculate the mass of salt in the initial solution.
m (salt) = m (solution) • W (salt) / 100% = 400 • 20/100 = 80 g.
Let us determine the mass of the solution after evaporation.
m (solution) = 400 – 100 = 300 g.
After the solution mass was reduced, the salt concentration increased.
W (salt) = m (salt) / m (solution) • 100% = 26.7%.
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