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April 2, 2015

Homework Help: Chemistry

Posted by Trisha on Sunday, October 21, 2012 at 8:58pm.

A sample of benzoic acid contaminated with NaCl and sand is to be recrystallized:

Benzoid Acid: Solubility in water at 100 degrees Celsius in g/100 mL = 6.8, at 0 degrees Celsius in g/100 mL = 0.2. NaCl: Solubility in water at 100 degrees Celsius in g/100 mL = 39.1, at 0 degrees Celsius in g/100 mL = 35.7.
Sand:Solubility in water at 100 degrees Celsius in g/100 mL = Insoluble, at 0 degrees Celsius in g/100 mL = insoluble

The sample initially contained 4.0 g of benzoic acid, 2.0 g of NaCl and 1.0 g of sand and was treated with 50 mL of boiling water, filtered by gravity and then cooled in ice to obtain a precipitate which was isolated by suction filtration. How much benzoic acid should be formed?

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