By evaporating 550 g of a 15% potassium nitrate solution, a solution of 220 g was obtained.
| September 11, 2021 | education
By evaporating 550 g of a 15% potassium nitrate solution, a solution of 220 g was obtained. What is the concentration (in%) of the resulting solution?
The mass of the initial solution is 550 g.
Mass fraction of the solution – 15%.
The mass of the resulting solution is 220 g.
Determine the mass fraction of the resulting solution.
First, the mass of the solute should be determined. We use the following formula.
W = m r.v / m r-ra * 100%.
Where w is the mass fraction.
m r.v is the mass of the solute.
m solution is the mass of the solution.
m r.w = 550 * 0.15 = 82.5 g.
Next, we determine the mass fraction of the resulting solution.
W = 82.5 / 220 * 100 = 37.5%.
Answer: the mass fraction of the resulting solution is 37.5%.
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