exam3key - CH 455 Prof J A Holcombe-wI'~ o 1\J CD < Exam J...

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-wI'~ CH 455 o 1:\ J\ Exam J Prof. J. A. Holcombe CD, June 24, 2009 Name _ (Also write your name in the upper right hand corner ofthe back side ofthe last page ofthis exam.) 1. 12 10 8 6 pH 4 2 0 Shown below are titration curves for 4 different solutions, each of which contains an acid. The amount of acid and/or K a of the acid may differ in each pair shown. Below each graph is a statement regarding the relative magnitude ofthe moles of acid and K a Place either >, < or ~ in the blank to best complete the statement. (12 pIS) 8 c 6 4 2 0 0 5 10 15 0 5 15 mL of base added a) K a for acid B """ K a for acid A c) K a for acid C -2- K a for acid 0 b) Number of moles of acid A <. moles of acid B d) Number of moles of acid 02-moles of acid C 2. Austin water is a carbonate-bicarbonate buffer system. At the right is the titration curve ~ mL of a water sample taken from a local creek. The molarity ofthe strong acid used as the titrant is 1.0 x 10- 3 What is 1 [CO;] and [HCO;] in the original sample? (8 pIS) (More space on top ofnext page) pH (/2 - ~.Z) /()"'3 . 7. rg x/o- J ~;ntP o 4 6 8 12 14 16 ~ mL of acid added ~~ ~ ~4&~ -;:) ~ 2)( I tJ -3) Jt1 ~ :.__ ----------~-_ -------::-- -- -.:5 -r- [{!
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This note was uploaded on 03/03/2010 for the course CH 455 taught by Professor Holcombe during the Summer '08 term at University of Texas.

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exam3key - CH 455 Prof J A Holcombe-wI'~ o 1\J CD < Exam J...

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