Question

1.A voltaic cell is constructed that uses the following reaction and operates at 298 K.

Zn(s) + Ni²⁺(aq) Zn²⁺(aq) + Ni(s)

2.A voltaic cell utilizes the following reaction and operates at 298 K.

3 Ce⁴⁺(aq) + Cr(s) 3 Ce³⁺(aq) + Cr³⁺(aq)

Answer 1

- 1. Znisz Anode ani call the / Reported values - Onidation Niat car the Cathode Cathode Reduction Ezn²/24 -0.76V (Standard Reduction Potential of Zn) Nill), L BNL2/N - - 0.23 V (Standard reduction Potential y Ni 29, + Niza (ay) — Nia) + Zu? (at) } - Pull col reachés, brew -(F ethake - Ermelo) meduction Notential form emf of cell • Evitt/ni - Emil/2n = -0,23,-1-0.76) 9 +053 V under standard Conditions ( Koncentration of Cans lm Temperature - 2986) (a so, Ecell = +0.53v/ from equation 0, 9 : (20²)'. -b duotiant factor [N:27] Uning Neret af equation AGO AGO+ RT ln T-nffuu e-nffus + RT la 1 Free - Ecle - 2.303 RT log b as [Nons) ]-[ 2(A)] (activities of fuse solid is taken to be unity) - . Universal Absolute Temperatura utient factor. Gas oer Censtand ne no of electrons transferred furaday's consta 1965oocy

CN, 2+] = 2,87 M , [Zn2+] = 0.106M 2 [2n?+] [NE 0.106 6 2:87 2 0.0369 Ecel 20:53 - 2.203 x 8:31 4 X 298 log (0,0369) no2 2496 500 (as overall 2e are transferred) Ecu 70,51 +0.042 Ecell 0,572 v (c) of (Ni2+] = 0,211, [ Zn²+] = 0,912M 22 Zna [Nize] 0-912_2464 0.219 O from 2053 - 2:303 X 8.314 x 299 los 14.164) XX 96100 30,53 -0.0183 (Feel 2 0151170 Cety + é Cathode, en Cems ) x3, Cet3 ) x3 reduction Cari Elery/cet3 +1.611 to - (1) Anuale Anode crt3 (as) t oridatia er C , Ext/6, 3-0.73V -0.73V - Beth (aq) + Cris) - Crt3(aq) + 3 Cet (aq) l Overall noodle Eleu = (Prethode - Emade reduction Patentich form Le transferról a ha? LE ce=9cets - E-%er) 21161 -40.73) 2 2.341

do [Cres (aq) } [CeB (ar))² (Fores") [Cet" (af)}} 5 (5) 4 (ce?")=1.3M, [cets 120.014m, cert] -0011M do 0,01x(13) 39809,215 ) 288 07,215. 0,011 X/13 10.oly Vrning Ners equation, Bell = teu - 2.3037 RXT los MMA Ecall = 2.34 - o.org - nouger transferred - 3 (8 807,215) 2,26 V Ecele 12261 (C) 94 [CeY] 20.5M , [Ce +372 0.81M, [Cyt?) -114m. 4x/0,81 = 5.952. P= {'** (65") =51952. Weing Norel-equation, a tou - 2.303 XRx Сен а єди - 2. 303 xixT , nxa fecall - 2:34 - 3 hoy, (5.952) = 2032V log (5.952) Ecle 22,321