From 300 g of solution, 1.75 g of potassium chloride was obtained by evaporation.
| January 5, 2021 | education
From 300 g of solution, 1.75 g of potassium chloride was obtained by evaporation. Find the mass fraction of salt in the original solution.
According to the formula for determining the percentage concentration of solutions.
W (in-va) = m (in-va) / m (solution) • 100%.
The mass fraction of salt in the original solution is.
W (KCl) = 1.75 / 300 * 100% = 0.58%.
Evaporated water mass:
m (H2O) = m (solution) – m (in-va) = 300 – 1.75 = 298.25 g.
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