At 100g. water at a temperature of 20 degrees Celsius can dissolve 31.6 g of potassium nitrate. Calculate the mass fraction
| August 6, 2021 | education
At 100g. water at a temperature of 20 degrees Celsius can dissolve 31.6 g of potassium nitrate. Calculate the mass fraction of a dissolved substance in a saturated solution of this salt at a given temperature.
The term mass fraction of a substance is the ratio between the mass of a particular substance and the mass of the entire solution. It is calculated by the formula:
w = m substance / m solution;
Typically expressed as a percentage.
w = (m-substance / m-solution) * 100%.
w = (31.6 / (100 + 31.6)) * 100% = (31.6 / 131.6) * 100% = 24%.
Answer: the mass fraction of KNO3 in a saturated solution of this salt is 24% at a temperature of 20 °.
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