A galvanic cell consists of a Pt| H3O+(1.00 M) | H2(g) cathode connected to a Pt | H3O+(aq)| H2(g) anode in which the concentration of H3O+is unknown but is kept constant by the action of a buffer consisting of a weak acid, HA(0.10 M), mixed with its conjugate base, A2(0.10 M). The measured cell potential is DEcell =0.150 V at 25°C, with a hydrogen pressure of 1.00 atm at both electrodes. Calculate the pH in the buffer solution, and from it determine the Ka of the weak acid.
A galvanic cell consists of a Pt| H3O+(1.00 M) | H2(g) cathode connected to a Pt | H3O+(aq)| H2(g) anode in which the concentration of H3O+is unknown but is kept constant by the action of a buffer consisting of a weak acid, HA(0.10 M), mixed with its conjugate base, A2(0.10 M). The measured cell potential is DEcell =0.150 V at 25°C, with a hydrogen pressure of 1.00 atm at both electrodes. Calculate the pH in the buffer solution, and from it determine the Ka of the weak acid.
Chemistry
10th Edition
ISBN:9781305957404
Author:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
Publisher:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
Chapter18: Electrochemistry
Section: Chapter Questions
Problem 120AE
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A galvanic cell consists of a Pt| H3O+(1.00 M) | H2(g) cathode connected to a Pt | H3O+(aq)| H2(g) anode in which the concentration of H3O+is unknown but is kept constant by the action of a buffer consisting of a weak acid, HA(0.10 M), mixed with its conjugate base, A2(0.10 M). The measured cell potential is DEcell =0.150 V at 25°C, with a hydrogen pressure of 1.00 atm at both electrodes. Calculate the pH in the buffer solution, and from it determine the Ka of the weak acid.
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