Please explain in detail the steps to solve this Complete and balance the fallauing redoxreaction in basic solutianZn(OH)4²cag) t As IS)2.) ->ZnS) + Hz As Oy Laq)

Answered: Complete and balance the fallauing…

Chemistry: Principles and Reactions

8th Edition

ISBN:9781305079373

Author:William L. Masterton, Cecile N. Hurley

Publisher:William L. Masterton, Cecile N. Hurley

Chapter17: Electrochemistry

Section: Chapter Questions

Problem 6QAP: Write balanced equations for the following reactions in acid solution. (a) P4(s)+Cl(aq)PH3(g)+Cl2(g)...

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Please explain in detail the steps to solve this

Complete and balance the fallauing redox
reaction in basic solutian
Zn(OH)4²cag) t As IS)
2.
) ->ZnS) + Hz As Oy Laq)

Expert Solution

Step 1

The redox reactions are the oxidation-reduction reactions, which involves simultaneous oxidation and reduction takes place. In the redox reactions, the transfer of electrons between two reactants produce two different products. The oxidation state of species changes due to electron transfer.

Step 2

The given reaction is as follows,

$Zn {(OH)}_{4}^{2 -} (aq) + As (s) \overset{}{\to} Zn (s) + H_{2} {AsO}_{4}^{-} (aq)$

The oxidation half-reaction is as follows,

$As (s) \overset{}{\to} H_{2} {AsO}_{4}^{-} (aq)$

The reduction half-reaction is as follows,

$Zn {(OH)}_{4}^{2 -} (aq) \overset{}{\to} Zn (s)$

Step 3

Balancing hydrogen atoms by adding H₂O molecules on deficient side in both the half reactions,

$As (s) + H_{2} O (l) \overset{}{\to} H_{2} {AsO}_{4}^{-} (aq)$

$Zn {(OH)}_{4}^{2 -} (aq) \overset{}{\to} Zn (s) + 2 H_{2} O (l)$

Balancing oxygen atoms by adding same number of H₂O molecules on the excess side and double the number of OH^- ions (since the medium is basic) on deficient side,

$As (s) + H_{2} O (l) + 6 {OH}^{-} (aq) \overset{}{\to} H_{2} {AsO}_{4}^{-} (aq) + 3 H_{2} O (l)$

$Zn {(OH)}_{4}^{2 -} (aq) + 2 H_{2} O (l) \overset{}{\to} Zn (s) + 2 H_{2} O (l) + 4 {OH}^{-} (aq)$

Step 4

After cancelling the water molecules,

$As (s) + 6 {OH}^{-} (aq) \overset{}{\to} H_{2} {AsO}_{4}^{-} (aq) + 2 H_{2} O (l)$

$Zn {(OH)}_{4}^{2 -} (aq) \overset{}{\to} Zn (s) + 4 {OH}^{-} (aq)$

Balancing the electrons on both sides,

$As (s) + 6 {OH}^{-} (aq) \overset{}{\to} H_{2} {AsO}_{4}^{-} (aq) + 2 H_{2} O (l) + 5 e^{-}$

$Zn {(OH)}_{4}^{2 -} (aq) + 2 e^{-} \overset{}{\to} Zn (s) + 4 {OH}^{-} (aq)$

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