Question

What will be the emf of a cell of two hydrogen electrodes, if a negative electrode is in contact with ${10}^{-8}M{H}^{+}$ion positive electrode is in contact with $0.025M{H}^{+}$?

• A. $-0.18V$
• B. $-0.28V$
• C. $-0.38V$
• D. $-0.48V$

Answer 1

The correct option is C $-0.38V$

$E=E_0-\frac{0.0591}{1}\log \frac{{\left[H^{+}\right]}_{anode}}{{\left[H^{+}\right]}_{cathode}}$

$=0-\frac{0.0591}{1}\log \left(\frac{0.025}{{10}^{-8}}\right)$

$=-0.378volt$