Question

Іго, Electrochemistry Wolleet 1. Assign oxidation numbers to each element in the following compounds: a. VOCI b. Cuso c. CHOH). d. Mno, e. SO, 2. Given the following half reactions and their standard reduction potentials, i. Cl (g) + 2e- - 2 CI (aq) E' =+ 1.36 V ii. Niº (aq) + 2e - Ni (s) E' = -0.25 V iii. Ag (aq) + e- Ag () E' = +0.80 V Identify the chemical species most likely to be oxidized. Identify the strongest oxidizing agent. Determine whether the net reaction: 2 Ag (s) + Ni** (aq) + 2 Ag (aq) + Ni (6) will be a product-favored reaction. Explain your answer. 3. Write the shorthand cell notation for the voltaic cell that incorporates the following redox reaction: Al(s) + Cr** (aq) → A1 (aq) + Cr(s) 4. Write the balanced equation for the redox reaction depicted by the following shorthand cell notation: Mn (8) Mn (aq) || Cd" (aq)| Cd () Balanced equation: Which species is oxidized? Which species is reduced? Which species is the oxidizing agent? Which species is the reducing agent?

Answer 1

is -2 and 1.0 Anst- Vou» Oxidation number of Oxygen that of chlorine is -I. ut Oxidation number of u be a then ut(-2) + (3x-1) = 0 2) 2-5-0 2) X= 45 Oxidation number of v is +5 6 - - Ans: Casoa . SOA has it oxidation -2 charge. number of Cu be x, then

Tu now has to charge. So, oxidation number of - Cu is +2. Oxidation number of oxygen atom s-2 and that of Sulphur is +6. Ans' COH) - het a le oxidation number of a, OH has - 1 so 2+ (ax(-1)) = -1 2) 2-4 = -1 2)2 =-1+4 2) 2 =+3 Oridation number of Cr is +3 and onidation number of Orygen is -2 and hydrogen atom is t. & Aus - no 2- ut x be oudation number of n then a +(4x-2) = -2 2) 1-8= -2 2)2 = -2+8 2) 2 - +6 Oxidation number of mm is to and Oxygen is -2

@ Aus- SO - Oxidation and sulphur state is +6 of Oxygen is -2 2 aus Hall cell reactions are 6 C (q) + 2e - →21 (aq) t = 1.36V @ 2t (ag) + 2e → Nj (s) 6 =-0.25V (w Aqt (aq) + e + Ag(s) E° : +0.80V. The chemical species most likely to be sodioul is No The strongest osidiaing agent is Chlorine gas The net reaction given is - 2Ag(s) + Njat (aq) → 2 Ag+ (aq) + Nils) - Uit us calculate to cell. E cell = E catrodo - to anode . Here Ag is oxidised to Agt so at anode oxidation takes place - .. E all = -0.25 V-0.800 = - 1.05 U

Tinco the value of Eocell is negative, the reaction is not product favoured reaction. was for the reaction to take place spontaneously, a should loe negative. We know ago = -nf Eocell. So, ago will lov negative if to cell is poactive. Thus the net reaction is not a product favoured reaction . . Aus - - The of The given reaction is al (a + cuts Cag) pets (09) + 6%). shorthand cell notation is grew Al(s) / Alta (aq) / Ents (ap) TGO 14 Aus- The grew shorthand cell notation is - Mn(s) / Moth Cag) Il Cd +2 (aq) Cl (s) The balanced chemical equation is My Cs) + Cd +2 (as) Mata (aq) + Cd (9)

mn+2 Col. Mn is oxidised to Cal ta is reduced to Celta is the oxidising Mom is the reducing agent agent .