# Answer the following in one or two sentences. What is standard cell potential for the reaction 3Ni(s) + 2Al3+ (1 M) → 3Ni2+ (1 M) + 2Al(s), if ENi∘ = - 0.25 V and EAl∘ = - 1.66 V? - Chemistry

Short Note

Answer the following in one or two sentences.

What is standard cell potential for the reaction

3Ni(s) + 2Al3+ (1 M) → 3Ni2+ (1 M) + 2Al(s), if "E"_("Ni")^circ = - 0.25 V and  "E"_("Al")^circ = - 1.66 V?

#### Solution

Given:  "E"_("Ni")^circ = - 0.25 V, "E"_("Al")^circ = - 1.66 V

To find: Standard cell potential

Formula: "E"_"cell"^circ = "E"_"cathode"^circ - "E"_"anode"^circ

Calculation: Electrode reactions are

At anode: Ni(s) → "Ni"_(("aq"))^(2+) + 2"e"^-

At cathode: "Al"_("aq")^(3+) + 3"e"^(-) -> "Al"_(("s"))

The standard electrode potential is given by

"E"_"cell"^circ = "E"_"cathode"^circ - "E"_"anode"^circ

"E"_"cell"^circ = "E"_"Al"^circ - "E"_"Ni"^circ

= (- 1.66 V) - (- 0.25 V) = - 1.41 V

The standard cell potential for the reaction is –1.41 V.

Concept: Electrode Potential and Cell Potential
Is there an error in this question or solution?

#### APPEARS IN

Balbharati Chemistry 12th Standard HSC for Maharashtra State Board
Chapter 5 Electrochemistry
Exercises | Q 2.05 | Page 118