A sample of potassium nitrate (49.0 g) is dissolved in 100 g of water at 100 deg

Question

A sample of potassium nitrate (49.0 g) is dissolved in 100 g of water at 100 degree C with precautions taken to avoid evaporation of any water. The solution to cooled to 30.0 degree C and a small amount precipitate is observed. This solution is _____ a. unsaturated b. hydrated c. placated d. saturated e. supersaturated An aqueous solution is saturated in both potassium chlorate and carbon dioxide gas at room What happens when the solution is warmed to 85 degree C? a. Potassium chlorate precipitates out of solution. b. Carbon dioxide bubbles out of solution. c. Potassium chlorate precipitates out of solution, and carbon dioxide bubbles out of solution. d. Nothing happens; all of the potassium chloride and carbon dioxide remained dissolved in solution.

Explanation / Answer

Question 7.

Note that there are TWO solutions

initially --> solution at 100°C

before precipitation --> solution at T = 30°C

after precipitation --> solution at T = 30°C

The solution initially is UNSATURATED, since all solid dissolves

then

after cooling, the solution becomes supersaturated

this can't be, so the solution will form precipitates

It forms precipitate until the solution becomes SATURATED,

The questino is most likely asking at the end, before precipitation

so choose supersaturated ( proof is the presence of precipitate)

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