Be sure to answer all parts. Use the activity series to predict the half-reaction that occurs at the anode and the half-reaction that occurs at the cathode of a voltaic cell for the following combination of half-reactions. [The notation Zn(s)/Zn2+(aq) used below indicates the components of one of the half cells: Zn metal electrode placed in an aqueous solution ofZn2+.] Zn(s)/Zn2+(aq) and Al(s)/Al3+(aq)Anode:  Cathode:

Question
Asked Nov 18, 2019
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Be sure to answer all parts.
 
Use the activity series to predict the half-reaction that occurs at the anode and the half-reaction that occurs at the cathode of a voltaic cell for the following combination of half-reactions. [The notation Zn(s)/Zn2+(aq) used below indicates the components of one of the half cells: Zn metal electrode placed in an aqueous solution ofZn2+.]
 
Zn(s)/Zn2+(aq) and Al(s)/Al3+(aq)

Anode:
 
 
Cathode:
 
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Expert Answer

Step 1

In the voltaic cell, the oxidation half -reaction occurs at anode and reduction half reaction occurs at cathode. In order to write the half reaction of each electrode, determine the element which is reduced and oxidized.

Given:

Zn(s)/ Zn2 (aq)and Al(s) / Al* (aq)
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Zn(s)/ Zn2 (aq)and Al(s) / Al* (aq)

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Step 2

Two possible half reactions are:

Al(s) + Zn** (s)
Zn(s)+Al
(aq)
or
Zn(s)+ Al* (aq)
A1(s)+Zn(s)
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Al(s) + Zn** (s) Zn(s)+Al (aq) or Zn(s)+ Al* (aq) A1(s)+Zn(s)

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Step 3

Aluminium is more reactivity than Zinc, So the aluminium s...

Als)+Z (s)Zn(s)+ Al* (aq)
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Als)+Z (s)Zn(s)+ Al* (aq)

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