Another saturated solution containing 106gAl * (NO3)3 / 100 g H2O O at 60^C (=106g) is very carefully cooled down in an ice bath (0 ^ 5 * C) (=60g) to produce an unstable supersaturated solution. A single tiny "seed crystal" is then added to induce crystallization. How many grams of Al(NO 3 ) 3 will crystallize out of the solution when it returns to being a saturated solution?

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10-01-2022
Chemistry

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Another saturated solution containing 106gAl * (NO3)3 / 100 g H2O O at 60^C (=106g) is very carefully cooled down in an ice bath (0 ^ 5 * C) (=60g) to produce an unstable supersaturated solution. A single tiny "seed crystal" is then added to induce crystallization. How many grams of Al(NO 3 ) 3 will crystallize out of the solution when it returns to being a saturated solution?

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mickymike92 mickymike92 · Answer 1 · 2022-01-14T10:00:59+01:00

The amount of solute that will crystallize out of the supersaturated solution when it returns to being a saturated solution at 0°C is 46 g

Saturated and Supersaturated Solution

A saturated solution is a solution that contains as much solute as it can dissolve at that temperature in the presence of undissolved solute particles
A supersaturated solution is a solution which contains more solute than it can normally hold at that temperature.

A supersaturated solution is unstable and the excess solute will separate out of the solution if disturbed slightly or a tiny solute crystal is added to it.

Solubility curves

A solubility curve is a graph or curve of solubility of a substance against temperature.

It is a curve that shows the effect of temperature on solubility of of a substance.

From the solubility data provided, the amount of solute that will crystallize out of solution can be determined:

Solubility of AgNO3 at 60°C = 106 g/100g H2O
Solubility of AgNO3 at 0°C is 60 g/100 g H20

When the solution was cooled to form a supersaturated solution, the solution contains 106g of AgNO3

When the solution returns to being a saturated solution at 0°C:

Amount of solute that crystallizes out = 106g - 60 g

Amount of solute that crystallizes out = 46 g

Therefore, the amount of solute that will crystallize out of the supersaturated solution when it returns to being a saturated solution at 0°C is 46 g

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