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Precipitate (WILL RATE LIFESAVER)

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Date Posted: 7/22/2008 2:08:27 PM  Status: Live
Precipitate (WILL RATE LIFESAVER)
Course Textbook Chapter Problem
General Chemistry Chemistry: The Central Science (10th) by Brown, Lemay, Bursten 16&17 N/A
Question Details:
This is my homework; but I need a solution.

200mL of 0.0400M BaCl2 are added to 600mL of 0.008M K2SO4.
Will a precipitate of BaSo4 (Ksp=1.1*10-10) form? Explain.
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Oracle
Karma Points: 10,583
Date Posted: 7/22/2008 7:57:27 PM  Status: Live
Asker's Rating: Lifesaver   
Response:
BaSO4<---> Ba2+ + SO42-
Ksp = [Ba2+][ SO42-] = 1.1E-10
.2 L x 0.04 M = 0.008 mol Ba2+
.6 L x 0.008 M = 0.0048 mol SO42-
Total volume = 0.8 L
 
Q = [Ba2+][ SO42-] = (0.008 / 0.8)(0.0048 / 0.8) = 6 x 10-5
Since Q > Ksp, a precipitate will form
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