Give the symbolic representation of the galvanic cell obtained by using the following standard reduction potentials at $298 \ K$ and calculate its standard cell potential $(E^o_{cell})$.
$(i)$ $E^o_{Ag^{+}|Ag} = 0.80 \ V$
$(ii)$ $E^o_{Zn^{2+}|Zn} = -0.76 \ V$
$(i)$ $E^o_{Ag^{+}|Ag} = 0.80 \ V$
$(ii)$ $E^o_{Zn^{2+}|Zn} = -0.76 \ V$
(N/A) In a galvanic cell,the electrode with the lower reduction potential acts as the anode (oxidation) and the electrode with the higher reduction potential acts as the cathode (reduction).
Here,$E^o_{Zn^{2+}|Zn} = -0.76 \ V$ (lower) and $E^o_{Ag^{+}|Ag} = 0.80 \ V$ (higher).
Therefore,$Zn$ acts as the anode and $Ag$ acts as the cathode.
The symbolic representation of the cell is: $Zn(s) | Zn^{2+}(aq) || Ag^{+}(aq) | Ag(s)$.
The standard cell potential is calculated as:
$E^o_{cell} = E^o_{cathode} - E^o_{anode}$
$E^o_{cell} = E^o_{Ag^{+}|Ag} - E^o_{Zn^{2+}|Zn}$
$E^o_{cell} = 0.80 \ V - (-0.76 \ V)$
$E^o_{cell} = 0.80 \ V + 0.76 \ V = 1.56 \ V$.
Here,$E^o_{Zn^{2+}|Zn} = -0.76 \ V$ (lower) and $E^o_{Ag^{+}|Ag} = 0.80 \ V$ (higher).
Therefore,$Zn$ acts as the anode and $Ag$ acts as the cathode.
The symbolic representation of the cell is: $Zn(s) | Zn^{2+}(aq) || Ag^{+}(aq) | Ag(s)$.
The standard cell potential is calculated as:
$E^o_{cell} = E^o_{cathode} - E^o_{anode}$
$E^o_{cell} = E^o_{Ag^{+}|Ag} - E^o_{Zn^{2+}|Zn}$
$E^o_{cell} = 0.80 \ V - (-0.76 \ V)$
$E^o_{cell} = 0.80 \ V + 0.76 \ V = 1.56 \ V$.
Explore More
Similar Questions
Which of the following reactions occurs at the cathode during the discharging of a lead accumulator?
DifficultMHT CET 2024
View SolutionIn $H_2-O_2$ fuel cell,the reaction occurring at the cathode is:
The Gibbs energy for the decomposition of $Al_2O_3$ at $500^oC$ is as follows:
$\frac{2}{3} Al_2O_3 \rightarrow \frac{4}{3} Al + O_2$
$\Delta_rG = +960 \ kJ \ mol^{-1}$
The potential difference needed for the electrolytic reduction of aluminium oxide $(Al_2O_3)$ at $500^oC$ is at least ........ $V$.
$\frac{2}{3} Al_2O_3 \rightarrow \frac{4}{3} Al + O_2$
$\Delta_rG = +960 \ kJ \ mol^{-1}$
The potential difference needed for the electrolytic reduction of aluminium oxide $(Al_2O_3)$ at $500^oC$ is at least ........ $V$.
$A$ button cell used in watches functions as follows:
$Zn_{(s)} + Ag_2O_{(s)} + H_2O_{(l)} \rightarrow 2Ag_{(s)} + Zn^{2+}_{(aq)} + 2OH^{-}_{(aq)}$
If the half-cell potentials are:
$Zn^{2+}_{(aq)} + 2e^- \rightarrow Zn_{(s)} \,;\, E^o = -0.76 \, V$
$Ag_2O_{(s)} + H_2O_{(l)} + 2e^- \rightarrow 2Ag_{(s)} + 2OH^{-}_{(aq)} \,;\, E^o = 0.34 \, V$
The cell potential will be $..........$ $V.$
$Zn_{(s)} + Ag_2O_{(s)} + H_2O_{(l)} \rightarrow 2Ag_{(s)} + Zn^{2+}_{(aq)} + 2OH^{-}_{(aq)}$
If the half-cell potentials are:
$Zn^{2+}_{(aq)} + 2e^- \rightarrow Zn_{(s)} \,;\, E^o = -0.76 \, V$
$Ag_2O_{(s)} + H_2O_{(l)} + 2e^- \rightarrow 2Ag_{(s)} + 2OH^{-}_{(aq)} \,;\, E^o = 0.34 \, V$
The cell potential will be $..........$ $V.$
MediumNEET 2013
View SolutionWhich of the following changes occurs during the discharging of a lead accumulator?
Vedclass Products
For Students
Vedclass Test Series
Mock tests in real JEE/NEET style with performance analysis. 5-day free trial.
Start Free TrialFor Teachers
Exam Paper Generator
Generate Set A/B/C/D exam papers from 7.5L+ questions in 2 minutes. 3 chapters free.
Try FreeFor Institutes
Online Exam Module
Live online exams with unlimited students, 360° analytics & white-label branding.
See Demo