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13 June, 05:26

A saturated solution of NaNO3 is prepared at 60.°C using 100. grams of water. As this solution is cooled to 10.°C, NaNO3 precipitates (settles)

out of the solution. The resulting solution is saturated. Approximately how many grams of NaNO3 settled out of the original solution?

(1) 46 g (3) 85 g

(2) 61 g (4) 126 g

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  1. 13 June, 07:43
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    The answer is (1) 46g. This is related to the solubility curve of the NaNO3. The solubility of NaNO3 under 60 ℃ is 126 g. And the solubility under 10 ℃ is 80 g. So the NaNO3 precipitates is 126-80=46 g.
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