2010_Midterm_2

2010_Midterm_2 - page 1 of 10 printer 7211 Key Midterm 2...

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Unformatted text preview: page 1 of 10 printer 7211 Key Midterm 2 CHEMISTRY 287 17 Nov 2010 Immediatelyright NOW . Write your name on the Answer Sheet ! Do not unstaple the exam. Hand in the entire exam. Always keep the answer sheet (at the back) covered except when you are writing an answer. Do not leave that sheet exposed. You may be involved in cheating if you do! Be very careful to circle the correct answer on the answer sheet! You may use any page or the back of any page for scratch paper EXCEPT the answer sheet. Watch the time carefully. You will not be allowed to go beyond the end of the exam time period. Different problems may have different point values page 2 of 10 printer 7211 page 3 of 10 printer 7211 Analytical Chemistry- 287A-2 nd midterm Formula Sheet for Chapters 11,14,16,18,19 H 2 O H + + OH- K w = 1. x 10-14 at 25C pK w = -Log(K w ) = -Log ([H + ] [OH- ] ) =pH + pOH CO 2 + H 2 O H + + HCO 3- pK a1 = 6.35 HCO 3- H + + CO 3-2 pK a2 = 10.33 tot = ([H + ] 2 + K a1 [H + ] + K a1 K a2 ) a = [CO 2 ] / C CO2 = [H + ] 2 / tot a 1 = [HCO 2- ] / C CO2 = K a1 [H + ] / tot a 2 = [CO 3-2 ] / C CO2 = K a1 K a2 / tot H 2 A H + + HA- pK a1 HA- H + + A 2- pK a2 f =0 pH = 0.5 * ( pK a1 + (-log C H2A )) 0< f <1 pH = pK a1 + Log ([HA- ] / [H 2 A] ) f =1 pH = 0.5 * (pK a1 + pK a2 ) 1< f <2 pH = pK a2 + Log ([A 2- ] / [HA- ] ) f =2 pH = pK w- ( 0.5 * (pK w- pK a2 + (-log C A2- )) f >2 pH = pK w- (-log C OH-excess ) E = E- 2.303 (RT / n F ) log( [Red] / [Ox]) F = 96,500 coulombs ; @25C 2.303 (RT / F ) =0.0592 page 4 of 10 printer 7211 E react = E 1- E 2 E = E react- 2.303 (RT / n F ) log( K react ) Ox1 + Red2 Red1 + Ox2 f =0 E = E 1- (RT/nF) ln( [Red1]/[Ox1]) - E ref 0< f <1 E = E 1- (RT/nF) ln([Red1]/[Ox1]) - E ref f =1 E = ( E 1+2- (RT/nF) ln( K eq ))/2 - E ref f >1 E = E 2- (RT/nF) ln( [Red2]/ [Ox2]) - E ref A = log ( Po / P) = abc = -log T Z 1 = x 11 c 1 + x 12 c 2 Z 2 = x 21 c i + x 22 c 2 F =...
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2010_Midterm_2 - page 1 of 10 printer 7211 Key Midterm 2...

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