Web Quiz 5 - answers

Web Quiz 5 - answers -...

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http://chemmac1.usc.edu/cgi-bin/randquiz.cgi 1 of 4 Web Quiz You can login to this page multiple times but you cannot take the quiz more than once. . Submit your answer for grading by Clicking on the "Grade Answers" button at the bottom of the page only when you are sure of your answers. Question # 1 Which of the following is not true for a solution at 25°C that has a hydroxide concentration of 2.5 x 10 -6 M? A. K w = 1 x 10 -14 B. The solution is acidic. C. The solution is basic. D. The [H] is 4 x 10 -9 M. E. The K w is independent of what the solution contains. Question # 2 If K a for HCN is 6.2 x 10 -10 , what is K b for CN - ? Note: CN - + H 2 O HCN + OH - K b = [HCN][OH - ] / [CN - ] A. 6.2 x 10 -24 B. 6.2 x 10 4 C. 1.6 x 10 -5 D. 1.6 x 10 23 Question # 3 If you know K b for ammonia, NH 3 , you can calculate the equilibrium constant, K a , for the following reaction: NH 4 + NH 3 + H +
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http://chemmac1.usc.edu/cgi-bin/randquiz.cgi 2 of 4 by the equation: A. K a = K w K b B. K a = K w / K b C. K
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This note was uploaded on 08/21/2008 for the course CHEM 105BL taught by Professor Warshel during the Spring '07 term at USC.

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Web Quiz 5 - answers -...

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