CW16A-Dis

CW16A-Dis - (a Use Ksp = 3.3 x 10-9 for CaCO 3 and data...

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CHM 2046/Myers Worksheet 16A February 16 or 18, 2010 1. Solubility in a Buffer. Recall that a buffer will set and hold a pH. So calculate [OH - ] for each buffer and assume this remains constant. For Mg(OH)2(s), Ksp = 6.3 x 10 -10 ; for Al(OH)3, Ksp = 3. x 10 -34 (a) What are the maximum [Mg +2 ] and [Al +3 ] in a pH = 12.0 buffer [Mg+2]max =______________ [Al +3 ]max = ______________ (b) What are the maximum [Mg +2 ] and [Al +3 ] in a pH = 9.0 buffer [Mg +2 ]max =______________ [Al +3 ]max = ______________ (c) How can we separated Mg +2 from Al +3 if we have a mixture their Cl - salts? 2. Combining Chemical Equations and their K Values, continued!

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Unformatted text preview: (a) Use Ksp = 3.3 x 10-9 for CaCO 3 , and data from the A/B table, to find the value of K for reaction as: CaCO 3 + HAc e Ca +2 + HCO 3-+ Ac-K = ______________ (b)Also find K for reaction as: CaCO 3 + 2 H 3 O + e Ca +2 + H 2 CO 3 + 2 H 2 O K = ______________ Compare these results with the equations obtained on Worksheet 16, items 4 (c) & (d). Study Problem : Use Ksp = 1.2 x 10-29 for Ca 3 (PO 4 ) 2 , and the A/B table, to find K for: Ca 3 (PO 4 ) 2 + 4 HAc e 3 Ca +2 + 2 H 2 PO 4-+ 4 Ac-...
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This note was uploaded on 09/19/2011 for the course CHM 2051 taught by Professor Staff during the Spring '08 term at University of Florida.

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CW16A-Dis - (a Use Ksp = 3.3 x 10-9 for CaCO 3 and data...

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