ch 08-12

ch 08-12 - ACTIVITY Daniel C. Harris Quantitative Chemical...

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1 Quantitative Chemical Analysis Seventh Edition Quantitative Chemical Analysis Seventh Edition Chapter 8-12 Acid-Base Titrations Copyright © 2007 by W. H. Freeman and Company Daniel C. Harris Daniel C. Harris ACTIVITY ACTIVITY How to calculate activity? 1: calculate Ionic strength 2: Use Table 8-1 BUFFERS
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2 BUFFERS BUFFERS
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3
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4 6.35 H 2 CO 3 H + + HCO 3 - ] CO [H ] [HCO log pK pH 3 2 - 3 a + = 5 - 3 - 10 1.2 10 1.02 log 6.35 pH × × + =
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5 Now add H + (remember, [H + ] 0 = 5.26 x 10 -9 ): 1) Enough to change [H + ] by 100X if no HCO 3 - : [HCO 3 - ]=1.02x10 -3 - 5.26x10 -7 =1.02 x 10 -3 , [H 2 CO 3 ]=1.25x10 -5 and pH = 8.3; Δ pH = 0.0 2) Enough to change [H + ] by 1,000X “ “ “: [HCO 3 - ]=1.02x10 -3 - 5.26x10 -6 =1.015 x 10 -3 , [H 2 CO 3 ]=1.72x10 -5 and pH = 8.1; Δ pH = -0.2 3) Enough to change [H + ] by 10,000X “ “ “: [HCO 3 - ]=1.02x10 -3 - 5.26x10 -5 =9.67x10 -4 , [H 2 CO 3 ]=6.46x10 -5 and pH = 7.5; Δ pH = -0.8 4) Enough to change [H + ] by 100,000X “ “ “: [HCO 3 - ]=1.02x10 -3 - 5.26x10
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This note was uploaded on 05/19/2010 for the course CHEM 150 taught by Professor Buratto during the Spring '08 term at UCSB.

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ch 08-12 - ACTIVITY Daniel C. Harris Quantitative Chemical...

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