In 200 g of 15% sodium chloride, 50 g of water was added. Calculate the mass fraction of sodium chlorine.

univerkov | January 6, 2021 | education

The mass of sodium chloride in the original solution.
m (NaCl) = W (NaCl) • m (solution) ref. / 100% = 15% • 200 g / 100% = 30 g.
The mass of the solution after adding water.
m (solution) = m (original solution) + m (H2O) = 200 g + 50 g = 250 g.
Let us determine the mass fraction of salt after diluting the solution.
W (NaCl) = m (NaCl) / m (solution) • 100% = 30 g / 250 g • 100% = 12%.

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