Question

A voltaic cell that uses the reaction tl3+(aq)+2cr2+(aq)→tl+(aq)+2cr3+(aq) has a measured standard cell potential of +1.19 v. write the two half cell reactio

Answer 1

The given net reaction is:

Tl³⁺(aq) + 2Cr²⁺ (aq) → Tl⁺(aq) + 2Cr³⁺(aq)

The half cell reaction are:

Anode(Oxidation): Involves loss of electrons

Cr²⁺(aq) ↔ Cr³⁺(aq) + e⁻  ----------(1)

Cathode(reduction) : Involves gain of electrons

Tl³⁺ (aq) + 2e⁻ ↔ Tl⁺ (aq) ---------(2)

The net equation can be obtained by:  2* eq(1) + eq(2)

Cr²⁺(aq) ↔ Cr³⁺(aq) + e⁻  ----------(1)*2

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 2Cr²⁺(aq) ↔ 2Cr³⁺(aq) + 2e⁻

Tl³⁺ (aq) + 2e⁻ ↔ Tl⁺ (aq) --

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Tl³⁺(aq) + 2Cr²⁺ (aq) → Tl⁺(aq) + 2Cr³⁺(aq)