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What is the standard cell potential (E°) for a galvanic cell composed of a zinc
What is the standard cell potential (E°) for a galvanic cell composed of a zinc electrode and a copper electrode?
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Practice Questions
1 question
Q1
What is the standard cell potential (E°) for a galvanic cell composed of a zinc electrode and a copper electrode?
0.34 V
1.10 V
0.76 V
1.96 V
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E° = E°(Cu²⁺/Cu) - E°(Zn²⁺/Zn) = 0.34 V - (-0.76 V) = 1.10 V.
Questions & Step-by-step Solutions
1 item
Q
Q: What is the standard cell potential (E°) for a galvanic cell composed of a zinc electrode and a copper electrode?
Solution:
E° = E°(Cu²⁺/Cu) - E°(Zn²⁺/Zn) = 0.34 V - (-0.76 V) = 1.10 V.
Steps: 6
Show Steps
Step 1: Identify the half-reactions for the zinc and copper electrodes. Zinc (Zn) will oxidize and copper (Cu) will reduce.
Step 2: Look up the standard reduction potentials (E°) for both half-reactions. For Cu²⁺/Cu, E° = 0.34 V. For Zn²⁺/Zn, E° = -0.76 V.
Step 3: Use the formula for standard cell potential: E° = E°(Cu²⁺/Cu) - E°(Zn²⁺/Zn).
Step 4: Substitute the values into the formula: E° = 0.34 V - (-0.76 V).
Step 5: Simplify the equation: E° = 0.34 V + 0.76 V.
Step 6: Calculate the final value: E° = 1.10 V.
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