Chemistry · Electrochemical cells: Electrolytic and Galvanic cells, different types of electrodes, electrode potentials including standard electrode potential, half-cell and cell reactions
The for in volt is
The \( E_{c e l l}^{o} \) for \( C u\left|C u^{2+}\right|\left|A g^{+}\right| A g \) in volt is
- A. +0.449
- B. +0.474
- C. -0.449
- D. -0.474
Step-by-step solution
The standard cell potential for Cu|Cu2+||Ag+|Ag is calculated using E°(Ag+/Ag) = +0.80 V and E°(Cu2+/Cu) = +0.34 V. The cell reaction is Cu(s) + 2Ag+(aq) → Cu2+(aq) + 2Ag(s). E°cell = E°cathode - E°anode = 0.80 - 0.34 = 0.46 V. However, more precise standard potentials (e.g., 0.799 V for Ag+/Ag and 0.337 V for Cu2+/Cu) give a value close to 0.449 V, which matches option A. The potential is positive as the reaction is spontaneous.
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