Fall 05. Exam2 key

Fall 05. Exam2 key - Chemistry 2101 Midterm #2 Name: {Sf...

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Unformatted text preview: Chemistry 2101 Midterm #2 Name: {Sf if) Q-Qr— - Student #: 1. /'4 2. /'6 3. /’4 £1. / 6 5. / 6 6. / 4 Total : / 30 Page 1 0f 3 Nov.9,2005 1) (4 paints) 10.32 mL df 0.0117 M KMnO4 is added in a 25.00 rnL aiiquni [if an oxalic acid solution to reach the end point. What is the csncsntratidn 01‘ the mafia acid? 502mm:l + 2Mn04' + 6H+ a 10003 + 2Mn2+ + 3 H20 (malic acid) is“ Q; HQ Mn Oz; Z'SAbflix10”iwmi WCA CQHQOH : 1:907 qumo\( Z‘CQHQOHT :1 3:016? Viafiqmd ©.©Q€CGL. CJ.CB\Q\ M .n—'— 1_-—'_ Page 2 of B > 2) (6 points) What is the full cell potential fer the galvanic cell shown below? The temperature is 2500. AgC|+e' a Ag[5]+CI' E”=D.222V Cd2++2e a Cdm} Et=-o.4o2v Page 3 at B 3) (4 points) a) A half cell gives a cell potential of —0.117 V with respect to a AgIAgCl reference electrode (E = +0.19?). What would the full cell potential be if this half cell was connected to a standard hydrogen electrode? #7 _____. tel/lam Wu: _.___._ O .7 l Al - *0er C 20 to]? #0.“? j *0; 030 \/ b) A half cell gives a cell potential of +0.010 V with respect to a Ag/AQCI reference electrode (E = +0.19?). What would the cell potential be if this half cell was connected to a saturated calomel electrode (E = +0241 V)? (Bel/5:30 SEE +—‘————’—-t——*l—— O Qilq? GWQLll l_l 7 l (:3.le ' Page 4 of 8 4) (6 points) A Ca2+ ien selective electrecle gives a signal ef 0.500 V when placed in a 0.100 M (3a2+ seiutien. What signal would this eieetrede give it placed in a seiutien eenJaining 0.150 M Ca2+ and 0.200 M Pb2+? Kcaghpbgi. is 0.50. The temperature is 25 C. Page 5 at 8 5) (6 peints) a) Draw a block diagram of an abserbanee spectrephetemeter shewing the key cempenents of this instrument. b) What fractien at light passes threugh a sample that gives an abserbanee reading at 1.25. A s: a! if [196/ HT: a, 0560 (do? [LS-'CQCZGB e) A sample gives a transmittance of 0.85 when measured en a speetrephetemeter. What is the abserbanee at this sample? A ‘5 filo (055658 5 I: 0,0?i Page 6 et 3 6) (4 points) What are the twe uses ef Nafien that we discussed in class? Explain why Nafien is particularly useful fer each applicatien. 13 PFOSFGR exclaciagd mamgmfli ‘m Qua/l Cd“; :0 Cchth lrs: Edefitwkl: L6 Carlos/‘1 @1013)!" (Am; “5&8? bflecl Km val <3: mm macs. L472 Wale;- ‘x 0‘: CkoPOuD/m 0Q“ A3:412 WWQKI - ULSon (“COS Or’xr HJF Cram C‘QGCJQ Jrc) We Cale/10% CGMPKQLQ JrLl-Q CEFCLEL: “In €CenflLln UQ\LQMMQX§3 MQQSLKQMEHLE M brain flQD-Lfi‘ofl Q.\\Gl,b§ CQX-ECJOLKC C‘XDVCMEQVQ. (“gecko 3:542, dackfléi SCJQCQ ' K [/SKALL\Q_, (1kach er” flQfiLUKE t tEffie-12$" DfifiQfl—kfi “liar; Coukcgtfflkfi - QKboglfiéA‘, qu Emil 3a COO SQLQC. l,qu -~\-rc.mgg;er Casio-m, -—M/nmt:jla Page T sf 3 ...
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Fall 05. Exam2 key - Chemistry 2101 Midterm #2 Name: {Sf...

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