NTA Abhyas NEET2020ChemistryElectrochemistryPractice
The standard reduction potential for C u 2 + / C u is 0.34 V. The reduction potential at pH = 14 for the above couple ( K s p C u ( O H ) 2 = 1 × 1 0 19 - ) is
Options
- A-0.22 V
- B-0.34 V
- C+0.22 V
- D+0.34 V
Correct answer
A. -0.22 V
Step-by-step solution
p H = 14 p O H = 0 OH − = 10 0 = 1 C u 2 + = K s p [ O H - ] 2 = 1 × 1 0 - 19 1 = 1 × 1 0 - 19 E Cu 2+ /Cu = E o Cu 2+ /Cu − 0 .059 2 log 1 1×10 − 19 = 0.34 V − 0.059 2 × 19 = − 0.22 V