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April 20, 2014

Homework Help: chem

Posted by Mischa on Wednesday, October 15, 2008 at 8:04pm.

The solubility of KNO3 is 155 g per 100 g of water at 75 degrees celcius and 38.0 g at 25 degrees celcius. What mass (in grams) of KNO3 will crystallize out of solution if exactly 100 g of its saturated solution at 75 degrees celcius is cooled to 25 degrees celcius.

i found that 60.8 g KNO3 is in the solution at 75degrees, and 27.5 g KNO3 at 25degrees. so 33.3 g would crystallize, but the right answer is 45.9 g. Not sure how to do the problem then...

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