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posted by  pilot boy on 4/28/2008 8:04:14 PM  |  status: Closed  

Effect of Temperature on solubility

Course Textbook Chapter Problem
General Chemistry Chemistry (9th) by Chang 12 N/A
Question Details:
The solubility of KNO3 is 155g per 100g of water at 75 degrees C and 38.0g at 25degrees C.  What mass in grams of KNO3 will crystalize out of solution if exactly 5.0x102 of it's saturated solution at 75 degrees C is cooled to 25 degrees C?
 
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posted by Jbroncos06balla on 4/28/2008 10:53:49 PM  |  status: Live
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Response Details:
At 75 degrees Celsius, 155 g of KNO3 dissolves in 100 g of water to form 255 g of solution.  When cooled to 25 degrees Celsius, only 38.0 g of KNO3 remained dissolved.  This means that (155 - 38.0) g = 117 g of KNO3 will crystallize.  The amount of KNO3 formed when 5.0 x 102 g of saturated solution at 75oC is cooled to 25oC can be found by a simple unit conversion:
 
                     5.0 x 102 g saturated soln  x  (117 g KNO3 crystallized / 255 g saturated soln)
                              =   229.412 g KNO3
 
 
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