Question

1. How do I read the half reaction table?
2. If im asked for the best reducing agent from Cu+, Ag+, F2, and Fe3+, where do I look first in the table? before the arrow or after the arrow?
3. Sometimes a value that has originally a positive (V) from the table it will have the negative sign in a homework problem, and viceversa, so the question is, how do I use the positive and negative signs in respect to the formation of the equation?

8° (V) 0.40 0.34 1.82 TABLE 11.1 Standard Reduction Potentials at 25°C (298 K) for Many Common Half-reactions Half-reaction 8° (V) Half-reaction F2 + 2e → 2F 2.87 O2 + 2H2O + 4e - 40H Ag?" + e → Ag 1.99 Cu2+ + 2e → Cu CO3+ + → Co2+ HgCl2 + 2e → 2Hg + 2Clº HO + 2H+ + 2e → 2H2O 1.78 AgCl + e Ag + Cl” Ce** + e - Ce+ 1.70 SO 2- + 4H+ + 2e → H2SO3 + H2O PbO2 + 4H+ + SO42- + 2e → PbSO4 + 2H2O 1.69 Cu2+ + e - Cu MnO4 + 4H+ + 3e → MnO2 + 2H2O 1.68 2H+ + 2e → H2 IO4 + 2H+ + 2e - IO3+H2O 1.60 Fe3+ + 3e — Fe MnO4 + 8H+ + 5e → Mn2+ + 4H2O 1.51 Pb2+ + 2e → Pb Au?+ + 3e → Au 1.50 Sn2+ + 2e → Sn PbO2 + 4H+ + 2e → Pb2+ + 2H2O 1.46 Ni2+ + 2e → Ni Cl2 + 2e → 2C1 1.36 PbSO, +2e → Pb + S0,- Cr 0,2- + 14H+ + 6e → 2Cr3+ + 7H2O 1.33 Cd²+ + 2e → Cd O2 + 4H+ + 4e → 2H20 1.23 Fe2+ + 2e - Fe Mno, + 4H+ + 2e → Mn2+ + 2H2O 1.21 Cr+ + e → Cr+ IO3 + 6H* + 5e + 12 + 3H2O 1.20 Cr3+ + 3e - Cr Br2 + 2e 2 Br 1.09 Zn2+ + 2e → Zn VO," + 2H+ + → VO2+ + H,O 1.00 2H2O + 2e → H2 + 2OH AuCl + 3e → Au + 4C1- 0.99 Mn2+ + 2e → Mn NO3 + 4H+ + 3e → NO + 2H2O 0.96 Alt + 3e → Al CIO, + c → CIO 0.954 H2 + 2e → 2H 2Hg2+ + 2e → Hg22+ Mg²+ + 2e → Mg Ag* + e → Ag 0.80 La't + 3e → La Hg22+ + 2e → 2Hg 0.80 Na te → Na Fe3+ + e Fe2+ 0.77 Ca2+ + 2e - Ca 0 + 2H+ 2e H2O2 0.68 Ba2+ + 2e → Ba MnO4 + → MnO, 0.56 K' te - K 12 + 2e 21 0.54 Lit te → Li Cu* te → Cu 0.52 0.27 0.22 0.20 0.16 0.00 -0.036 -0.13 -0.14 -0.23 -0.35 -0.40 -0.44 -0.50 -0.73 -0.76 -0.83 -1.18 -1.66 -2.23 -2.37 0.91 2.37 -2.71 -2.76 -2.90 -2.92 -3.05

Answer 1

Hall reaction 1 t can be onides Onidation Haly reaction - caur á reduction Hely reactica, Ovidactico s O Increase in Ourolation Aboute, hors of electrons. 9 Addition of oxygen or removal of Hydrogen. Reduction o Decrease in onidation State @ Gain of electrons ③ Removal of Orygen or addition of Hydrogen. Now, in the Half reaction reaction Table Standard potentials are ginen but in reduction form. reduchu Patential & faudaget og Co? + é (+3) Ecold/cota = + 2.82 V ( o Decrease in Oniolation State - Reducha Maly reaction

(41) te - Ceny, Ecurile = + 0.520 (reduction Hall 1 reaction) C Mgt té — Aque), Em77/4, 3 + 0.80V 14. té - , = +2.87V ( fent té — fe me, ffery/fet +0.79V té - - - + 2,87V New, If the sign of E' in the then the reaction is Thermodynamically favourable as A4 = -nf tell Higher the positive value of e, more negative in the value of AGO (Higher spontaneity). Reducing agent in the agent which reduces the substance & itself geti onidised from the values above mentioned It is clearly visible than Fire Reduction offe is highly favourable while reduction of het is least favourable. flance, Cu will be the best reducing agent among all, You can look in at the standard reduction potentials for answering the best onedining or reducing agent - Higher the reduction potential higher is the tendency trwards reduction, this powerful Ovidising agent, while lower is the reduction potentiach will act as good reducing agent.

(?) Suppreadly you are gen a gabond coll which is a ne done Couple of an - lu ten the fan the table au has higher Reduction patruchal as compared to Zn . Earthu a t 0.34 Cut will he favouring an F%n%2m = -0.76V..2.1 will be favouring Cuklation loudelia Abenbal hoorbal dx, Erores De y amore noducetine (€ n/?new) + Cad 2/2 0,96 V 270.96 - 0:34V (priblation potential) 2 /۰/v/