Activity Coefficients Worksheet

Activity Coefficients Worksheet - Find the concentration of...

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Activity Coefficients Worksheet 1. Calculate the concentration of Pb 2+ in a saturated aqueous solution of PbF 2 . Consider that γ Pb 2+ = 0.867, γ F - = 0.964 and K sp for PbF 2 is 2.7x10 –8 . 2. If K sp for Hg 2 Br 2 is 5.6x10 -23 , calculate the concentration of Hg 2 2+ in saturated solutions of Hg 2 Br 2 in: (a) 0.00100 M KNO 3 ( γ Hg 2 2+ = 0.867, γ Br - = 0.964 ) (b) 0.0100 M KNO 3 ( γ Hg 2 2+ = 0.660, γ Br - = 0.899 ) (c) 0.100 M KNO 3 ( γ Hg 2 2+ = 0.355, γ Br - = 0.755 ) 3. A saturated aqueous solution of Ba(IO 3 ) 2 is also 0.100 M in (CH 3 ) 4 NIO 3 .
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Unformatted text preview: Find the concentration of Ba 2+ in this solution if K sp for Ba(IO 3 ) 2 is 1.5x10 9 . Consider that Ba 2+ = 0.38 and IO 3-= 0.775. 4. Calculate the ionic strength of the following solutions assuming at this low concentrations complete dissociation. (a) 0.0087 M KOH and (b) 0.0002 M La(IO 3 ) 3 Answers 1: 2.0x10-3 M Pb 2+ 2a: 2.6x10-8 M Hg 2 2+ 2b: 3.0x10 8 M Hg 2 2+ 2c: 4.1x10 8 M Hg 2 2+ 3: 6.5x10-7 M Ba 2+ 4a: 0.0087 4b: 0.0012...
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