Consider the cell at 298 K represented by Pt(s) | H2(g, 0.20 atm) | H+(aq, 1.0 M) ‖…

CHEMISTRY · Multi-part · A Level · Chemistry · Electrode potentials · Electrode potentials

Problem

Consider the cell at 298 K represented by Pt(s) | H2(g, 0.20 atm) | H+(aq, 1.0 M) ‖ Ag+(aq, 1.0 M) | Ag(s) Standard reduction potentials are 2H+(aq)+2e−→H2(g)

E^{\rm o}=0.00\,\text{V}

Ag+(aq)+e−→Ag(s)

E^{\rm o}=+0.80\,\text{V}

(a) Identify which electrode functions as the cathode and which as the anode. Justify your answer. (b) Calculate the cell potential

E_{\text{cell}}

(in volts) under the specified conditions. Show all work. (c) The cell potential would change if the partial pressure of H2 were increased to 1.0 atm while all other conditions remained the same. Without performing another numerical calculation, predict whether

E_{\text{cell}}

would increase, decrease, or stay the same, and provide a brief justification.

Related theory

Electrode Potential
Galvanic Cells
Nernst Equation
Electrochemistry

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