Quiz 1 Incomplete - Quiz 1 CHM 2046 Spring 2009 Prof. C.R....

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IN ORDER TO RECEIVE FULL CREDIT YOU MUST SHOW ALL OF YOUR WORK ALL WORK MUST BE CLEAR AND LEGIBLE Name:___________________________________ UFID:___________________________________ Compound K a HOSO 3 - 1.2 x 10 -2 HF 7.1 x 10 -4 HNO 2 4.5 x 10 - 4 HCOOH 1.7 x 10 -4 CH 3 COOH 1.8 x 10 -5 HOCl 2.9 x 10 -8 HCN 4.9 x 10 -10 NH 4 + 5.6 x 10 -10 1. Why do chemists prepare and use buffer solutions? 5 pts Chemists prepare and use buffer solutions to control the pH of a solution. Since a buffer is resistant to changes in pH, a chemist can used a buffer solution to carry out pH dependent experiments. 2. What is the definition of a Lewis Acid and a Lewis Base? Provide an example of a Lewis Acid/Base reaction that does not include a Brønsted acid. 5 pts A Lewis Acid is an electron pair acceptor . 1 pt A Lewis Base is an electron pair donor. 1pt BF 3 (Lewis Acid) + NH 3 (Lewis Base) NH 3 - BF 3 1pt 1pt 1 pt 3. Why are all Lewis Bases also Brønsted bases? 5 pts All Lewis bases can be protonated since a Lewis base has a lone electron pair. By
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This note was uploaded on 03/02/2009 for the course CHM 2046 taught by Professor Veige/martin during the Spring '07 term at University of Florida.

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Quiz 1 Incomplete - Quiz 1 CHM 2046 Spring 2009 Prof. C.R....

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