# Solution, Solute and Solvent Problem 2

Chemistry Level 2

A $$80^\circ \text{C}$$, $$100\text{ g}$$ of $$\ce{KNO_3}$$ saturated solution is cooled to $$20^\circ \text{C}$$. What is the mass of $$\ce{KNO_3}$$ in grams that will separate out from the solvent?

Details and Assumptions:

Separate out: when it used to have some mass dissolved in a saturated solution but as the temperature decrease, the solubility decrease so some of the solute cannot remain dissolve and will return as solid/liquid state until it reaches the solubility within the new temperature.

Solubility of $$\ce{KNO_3}$$ at $$80^\circ\text{C}$$: $$169\text{ g}/100\text{ g}$$ water.

Solubility of $$\ce{KNO_3}$$ at $$20^\circ \text{C}$$: $$31.6\text{ g}/100\text{ g}$$ water.

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