A) decreases by 59.1 mV
B) increases by 59.1 mV
C) remains unchanged
D) becomes zero
Correct Answer: B
Solution :
From Nernst equation, \[E=\frac{-RT\,{{\log }_{10}}\,pH}{F}\] This equation tells us that every decrease in pH of one unit, the potential of hydrogen electrode increases by\[\frac{RT{{\log }_{10}}}{F}(\approx 59.1\,mV\,at\,298\,K)\]. The Nernst equation has thus given us the pH dependence of any reaction involving hydrogen ions.
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