In a solution of salt weighing 150 g with a mass fraction of salt of 15%, 30 g of water was added
| May 4, 2021 | education
In a solution of salt weighing 150 g with a mass fraction of salt of 15%, 30 g of water was added to find a new mass fraction.
The mass of salt in the original solution.
m (salt) = W (salt) • m (solution) / 100% = 15% • 150 g / 100% = 22.5 g.
The mass of the solution after adding water.
m (solution) = 150 g + 30 g = 180 g.
Mass fraction of salt in solution.
W (salt) = m (salt) / m (solution) • 100% = 22.5 g / 180 g • 100% = 12.5%.
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