Assigned problems _9 answers - Chemistry 2080 Spring 2011...

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Unformatted text preview: Chemistry 2080 Spring 2011 ANSWERS to Problem Set #9 - due date: Friday April 22rd at 2 pm Name:________________ Lab TA Name:__________________ Lab Day/Time:______________________ 1) Suppose that 50.0 mL of a 0.0500 M solution of Pb(NO 3 ) 2 is mixed with 40.0 mL of a 0.200 M solution of NaIO 3 at 25C. Calculate the [Pb 2+ ] and [IO 3 ] when the mixture comes to equilibrium. At this temperature, K sp for Pb(IO 3 ) 2 is 2.6x10-13 . __________________________________________________ The solubility product refers to the equation: Pb(IO 3 ) 2 (s) Pb 2+ (aq) + 2IO 3 (aq) K sp = 2.6x10-13 50.0 mL of 0.0500 M Pb(NO 3 ) 2 contains (50.0)(0.0500) = 2.50 mmol of Pb 2+ , since the nitrate salt will be essentially completely dissociated in water. Also, 40.0 mL of 0.200 M NaIO 3 will contribute 8.00 mmole of IO 3- ions, since sodium iodate will also be essentially completely dissociated in water. The 2.50 mmole of Pb 2+ will combine with 5.00 mmole of the iodate anion, thus leaving 8.00 5.00 = 3.00 mmole of iodate in 50+40 = 90will combine with 5....
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This note was uploaded on 04/29/2011 for the course CHEM 2080 taught by Professor Davis,f during the Spring '07 term at Cornell University (Engineering School).

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Assigned problems _9 answers - Chemistry 2080 Spring 2011...

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