Answered: Write down the electrode reaction and…

Chemistry: The Molecular Science

5th Edition

ISBN:9781285199047

Author:John W. Moore, Conrad L. Stanitski

Publisher:John W. Moore, Conrad L. Stanitski

Chapter17: Electrochemistry And Its Applications

Section: Chapter Questions

Problem 84QRT

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Question

Write down the electrode reaction and cell reaction of the following cells.
a) Zn| Zn 2+ (aq) ║ HCl (aq) | H 2 (g), Pt
b) Li(s) │ LiCl(aq) ║ KCl (aq) │Hg 2 Cl 2 (s) │ Hg(l)
c) Pt | Fe 2+ (aq), Fe 3+ (aq) ║ HCl (1M) | H 2 (g), Pt

Expert Solution

Step 1

A chemical reaction which involves oxidation and reduction of chemical species is known as redox reaction. In an electrochemical cell oxidation and reduction takes place at anode and cathode, respectively.

Step 2

(a)

The given representation of the cell is,

$Zn | {Zn}^{2 +} (aq) ∥ HCl (aq) | H_{2} (g), Pt$

The reaction that takes place at anode (oxidation) is,

$Zn (s) \to {Zn}^{2 +} (aq) + 2 e^{-}$

The reaction that takes place at cathode (reduction) is,

$2 H^{+} (aq) + 2 e^{-} \to H_{2} (g)$

The cell reaction is,

$Zn (s) + 2 H^{+} (aq) \to {Zn}^{2 +} (aq) + H_{2} (g)$

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