Question

At the turn of the 20th century, electric automobiles were more popular than gasoline-fueled cars. Thomas Edison, the prolific American inventor, was interested in electric automobiles and developed an iron-nickel (Fe-Ni) battery to power them. He claimed that, due to their higher energy density, his batteries were superior to the lead-acid batteries then being used in automobiles. Today, the Edison battery is available in various voltages up to 48 V. It is used in London subway locomotives, in New York City subway cars, for standalone locations that are off the electric power grid, and for backup emergency power. The battery has a NiO(OH) cathode, an iron anode, and uses a mixture of KOH and LiOH as the electrolyte. The half-reactions are:

Cathode: ???(??)(?) → ??(??)2(?)

Anode: ??(?) → ??(??)2(?)

The E_cell^o is 1.37 V at 25 °C, which drops to 1.2 V when operating.

(a)Assign an oxidation number to nickel in the reactant and product of the cathode reaction

(b)Identify what is oxidized and what is reduced

(c)Write a balanced chemical equation for the overall cell reaction

(d)Calculate the cell voltage at 25 °C when the hydroxide ion concentration is 3.5 M

Answer 1

att ode: Niocon) → Ni Louha Anode : fees) → fecona full: 1.37 v at osºn - a onidation number to Nickel is reactant Niocou noutral atea) +(1) -0 ♡ X 2+3 Ni: +3O'S At product Nilon)ą :0 x+(-ag=0 Nixota cos) b) Here re at o re to si at o oxidation state is oxidised reta o state where as from ts is reeduced to ta os. н; o Cs) te"- 4* (9) ха re(s) en recond, the aniocon) + Fe Felony Tani (OM)

• the chance we multiplied neutralise wath by a from Hernst er nation Ecel Ecell -0.059 log Comoroitar) Cliven Cor] =3.5m from above chemical equations leur - At product side total 6 com) is Present and at reactant along to - net (on) = 4 oo product side т: ae - Can @ aeg Forgenoa) соли : сец - орх9 və ( (ок" ј4) : 137-0099 log( 3-5) 21:37 -0.059 x4 log (35) 0 " Ece : 1. 307 v
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