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Unformatted text preview: Quantitative Analysis Lecture, Chem. 222 Fall 2010 Practice exam #2, total grade = 100 You have 50 minutes to complete this exam. It is a closed book exam; only calculators are allowed. Watch for significant figures. Show work, partial credit will be given. Showing a numerical answer to any of the problems is not sufficient to qualify for a pass. Print Name_________________________________ Signature________________________________________________ Problem # 1 (16 pts): Fractional Composition Diagrams A fractional composition diagram is plotted below for o-phosphoric acid. (a) (4 pts) Write the pertinent acid-dissociation reaction equations in the full pH range, showing participation of water in the equilibria. (b) (4 pts) Give approximate K a values (not pKas) as read from the plot. (c) (4 pts) What is the principal species at pH = 14.00? (d) (4 pts) What is the principal species at pH = 0.00?...
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This note was uploaded on 12/28/2010 for the course CHEMISTRY 222 taught by Professor Wieckowski during the Spring '10 term at University of Illinois at Urbana–Champaign.
- Spring '10