Test-exam 2

23 9 kb 17 10 therefore we need to consider only c or

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Unformatted text preview: Acid ] molbase 10 pH pKa molacid molbase For NH3, 10 pH pKa 105.059.25 6.3 105 molacid molbase For C5H5N, 10 pH pKa 105.055.23 0.66 1.0 :1.5 molacid 8 11. The figure below is obtained from the Buffers and Indicators experiment. R1 is defined as [ In ] Aa A R1 [ HIn] A Ab where HIn and In are the acidic and basic forms of the indicator bcg, respectively. Based on this graph, which one of the following statements is NOT TRUE. log(R1) vs. pH at 460nm 4 2 0 2.00 -2 -4 pH 3.00 4.00 5.00 6.00 a. b. c. d. log( R1) m pH b , where m is the slope and b , the intercept. R1 can be greater than zero or less than zero.* 2 Within the measured region, the R (i.e., the coefficient of determination) appears to be close to 1. When log( R1 ) 0 , [ In ] [ HIn] [ In ] increases and [ HIn] decreases. e. As pH increases, log(R1) Oxidation of Ethanol by Dichromate Ion 12. Consider the following rate law: Rate k [ A] [ B ] . The exponents, n and m , are determined a. based on the subscripts of the chemical formul...
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This note was uploaded on 03/03/2011 for the course CHEM 100A taught by Professor Dai during the Spring '06 term at UCSD.

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