Question
The standard potential of Cu ^ +2 / Cu is 0.34 V at 298 K. Calculate its potential at the same temperature when the Cu ^ +2 ion concentration is 0.1 M.
MHT CET
Chemistry
Electrochemistry
2026
MHT CET 2026 (11 April Shift 2)
MHT CET Chemistry Question (2026) — Solution
Options
- A. 0.64 V
- B. 0.34 V
- C. 0.31 V
- D. 0.37 V
Answer
C. 0.31 V
Step-by-step solution
The reduction half-reaction is Cu ^ +2 + 2e^ - Cu . Using the Nernst equation for the electrode potential: E = E^ - 0.0591 n 1 [ Cu ^ +2 ] Given E^ = 0.34 V, n = 2, and [ Cu ^ +2 ] = 0.1 M. E = 0.34 - 0.0591 2 1 0.1 E = 0.34 - 0.0295 10 E = 0.34 - 0.0295 1 E = 0.3105 V 0.31 V. Answer: 0.31 V
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