# Worksheet: Calculating Cell Potentials from Reduction Potentials

Q1:

A galvanic cell consists of a electrode in 1 Mβ solution and a electrode in 1 Mβ solution. What is the standard cell potential?

Half-equation Standard electrode potential, πΈ β¦΅ (V) M g ( ) + 2 e M g ( ) 2 + β a q s A g ( ) + e A g ( ) + β a q s β 2 . 3 7 2 + 0 . 7 9 9 6

Q2:

Using the standard electrode potentials shown in the table, determine which of the following metals are capable of reducing to metal.

 Half-equation Standard electrode potential, πΈ β¦΅ ( V ) C a ( ) + 2 e C a ( ) 2 + β a q s A l ( ) + 3 e A l ( ) 3 + β a q s F e ( ) + 2 e F e ( ) 2 + β a q s L a ( ) + 3 e L a ( ) 3 + β a q s β 2 . 8 6 8 β 1 . 6 6 2 β 0 . 4 4 7 β 2 . 5 2
• A only
• B only
• C and
• D only
• E and

Q3:

The standard reduction potentials for oxygen gas and two cobalt(III) complexes are shown below:

 Half-equation Standard electrode potential, πΈ β¦΅ ( V ) O ( ) + 4 H ( ) + 4 e 2 H O ( ) 2 + β 2 g a q l [ C o ( H O ) ] ( ) + e [ C o ( H O ) ] ( ) 2 6 3 + β 2 6 2 + a q a q [ C o ( N H ) ] ( ) + e [ C o ( N H ) ] ( ) 3 6 3 + β 3 6 2 + a q a q +1.229 +1.8 +0.1

Based on the cell potentials, which of the two complexes, and , can be oxidized to the corresponding cobalt(III) complex by oxygen? Assume that all reactions take place under standard conditions.

• ANeither nor
• B but not
• C and
• D but not

Q4:

Using the standard electrode potentials shown in the table, calculate to 3 decimal places the cell potential for the electrochemical cell:

Half-equation Standard electrode potential, πΈ β¦΅ ( V ) C d ( ) + 2 e C d ( ) 2 + β a q s N i ( ) + 2 e N i ( ) 2 + β a q s β 0 . 4 0 3 0 β 0 . 2 5 7
• A 0.125 V
• B 0.146 V
• C 0.155 V
• D 0.167 V
• E 0.164 V

Q5:

Using the standard electrode potentials in the table below, calculate the standard cell potential for a galvanic cell with the overall reaction:

Half-equation Standard electrode potential, πΈ β¦΅ (V) S n ( ) + 2 e S n ( ) 2 + β a q s C u ( ) + e C u ( ) 2 + β + a q a q β 0 . 1 3 7 5 + 0 . 1 5 3

Q6:

What is the standard electrode potential for the galvanic cell with the following overall reaction?

Half-equation Standard electrode potential, πΈ β¦΅ (V) A g ( ) + e A g ( ) + β a q s F e ( ) + 2 e F e ( ) 2 + β a q s + 0 . 7 9 9 6 β 0 . 4 4 7

Q7:

Using the standard electrode potentials in the table below, calculate the standard cell potential for a galvanic cell consisting of / and / half-cells.

Half-equation Standard electrode potential, πΈ β¦΅ (V) A u ( ) + 3 e A u ( ) 3 + β a q s N i ( ) + 2 e N i ( ) + β a q s + 1 . 4 9 8 β 0 . 2 5 7
• A V
• B 1.241 V
• C V
• D 1.755 V