What is the ecell° for the following cells? a. al|al³⁺ || au³⁺|au b. zn|zn²⁺ || hg²⁺|hg c. li|li⁺ || ni²⁺|ni

Answers:

(a) +3.160 V; (b) +1.613 V; (c) +2.783 V

Explanation:

We must look up the standard reduction potentials for the half-reactions.

The half-reaction on the left-hand side of the cell diagram is an oxidation, so we reverse the sign of E°, and then add the two half-reactions and their E° values.

(a)

Al ⟶ Al³⁺ + 3e⁻;            +1.662 V

Au³⁺ + 3e⁻ ⟶ Au;         +1.498 V  

Al + Au³⁺ ⟶ Al³⁺ + Au; +3.160 V

(b)

Zn ⟶ Zn²⁺ + 2e⁻;           +0.762 V

Hg²⁺ + 2e⁻ ⟶ Hg;          +0.851 V

Zn + Hg²⁺ ⟶ Zn²⁺ + Hg; +1.613 V

(c)

2×[Li ⟶ Li⁺ + e⁻];          +3.040 V

1×[Ni²⁺ + 2e⁻ ⟶ Ni];      -0.257 V

2Li + Ni²⁺ ⟶ 2Li⁺ + Ni; +2.783 V

explanation:

venn diagram is pictorial representation with of circles showing the relation between two finite sets or things. the intersection part of two circles conveys the relation present in between those sets or things.

here in the venn diagram of sand and salt two circles represent sand and salt. but the area falling under the intersection of these circle represents the mixture of sand and salt.

so, in a venn diagram the mixture will be placed in a middle that is in between the intersection of two circles.