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Chem 103A Electrochemistry 5. A voltaic cell is to be constructed using the Ag/Ag half cell and the Pb/Pb half-cell. Measurement shows that the silver electrode is positive. a) Write balanced half-reactions and the overall spontancous reaction, without using a table of half-cell potentials. b) Diagram the cell, labeling electrodes as anode and cathode, labeling the salt bridge, showing what ions are in solution, and showing the direction of electron flow in the circuit and of cation and anion flow in the salt bridge. c) Using a table of half-cell potentials, calculate the standard cell potential for the cell you have diagrammed above. Did you choose your electrodes correctly? 2

Answer 1

6 The voltaic coll is to be constructed by using the Agt Agt half Cell and the PolP621 half coll. is that the silner ou shouls that the silner electrode is positive. Ginen measurorent In Calvanic cell cathode Cathode is positive electrode ro illner Electrode is positive cathode electrode and lead olochrode is negative, ano de electrode. (a) Port the ag ④ x 2 Anode: Pb - Cathode: Agt té t Overall Pb + 2 Ag+ reaction. thwefcument 0 P62+ + 2Ag) I salt bridge - Cathede (Age lectrode) the) lu anochet the electrode) (Pb electrode) Anode > Po - Pb2+ +20--0 xo cathode + Agt te Overall 760 ction Pb + 2 Ag+ Po2+ + 2Ag Ecoll = (top) anade - (69) cathode Ecell = + 0.93 voltit (from table) (vlnen in auestion-6) For Construction of a coll Eroll should be. positive value I with

@ As we know at cathode that catrode ix the reduction the positive le drone potential in higher. to be cathode So that the reater - the higher the the tendony of a metal to be reduction Potential of that Coll Nolta +0.93 tolectrode / Agl Agt - electrode IP61P 62+ 1 Erlorest 12 Agl Agt Gricht -1.54 tool Poip 62T Higher oxidation or Z eb Age potential order a - In this question half cell data is not ginen. So Electrochemical Series based on I am explaining. Em (RP - Roduction potential) Si R.PN oup Tres loylaation Potental) 35 39 2531 Scanne with Camsynner

Highest oxidation Potential - Ag luulest oxidation Potential cr the the reduction reduction potential coton Higher agent auth as a good oxidexing DY stronge 8t @ Given Half Deuchon 25+ pt2t - Caqu Po(s) (Ed=-0.13 Pb2+16 E Agt / Ag = ? tocat lor=? (to polport = 0.00 From table wo know that For flat call (E) MyP62+ || Ag+ 1 Ag = 0.3 volt Edell = (E°) polpb2+ - (), *lngt Potential 0.93 -- (E9p6+p6+ (Agt lag 0-93 = -(-0.13) +Ong+log (E) Ag+14) = 0,93–013 op oxidation (E) Ag+ (Ag = 0.80 volt (E) Cr3+ |1 P621p6 = + ab) (E) cell = 0.61 = (E) crort - (E) po 1962+ 0.61 (E) Cor 10r3+ +0.13 & Cr Cr3+ = Dobit 0.13 = 0.74 volt Similarly, O-P with ner

@ Zn(s) 2222426 .. At 25°C can Colett +26- 704(S) ** @ zņ(5) +C42+ Cars — 2424 (aq) Zn(s) + ceret caq) - zhlt (aq) + Cucs) standard free Energy (F=96500 Coloumb) AGO - HEF + CMC) AGO - 2x110x96500 Duo - 212, 300 Jule Imole kalwin Inho = - 212.3 kylmol-Keluin

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