Chemistry
9th Edition
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Author:Steven S. Zumdahl
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Chapter18: Electrochemistry
Section: Chapter Questions
Problem 83E: Consider a concentration cell that has both electrodes made of some metal M. Solution A in one...
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I don't understand what the xM is or how to find [H+]

TUTOR Calculate pH Using the Nernst Equation
A concentration cell consisting of two hydrogen electrodes (PH, = 1 atm), where the cathode is
a standard hydrogen electrode and the anode solution has an unknown pH, has a cell voltage
of 0.186 V. What is the pH in the unknown solution? Assume the temperature of the solutions
is 298 K.
pH =
Submit
Show Approach Hide Tutor Steps
TUTOR STEP
The equations for the anode and cathode reactions are in the
they give
proach. When summed
2 H*(aq, 1 M) =2 H*(aq, x M)
which gives
[H* (aq, x M)|_ [H*(aq, x M)]?
[H* (aq, 1 M)]?
(1 м)?
Use this to solve for the unknown [H*] and the pH. Enter the pH value.
pH = 8.3
( Recheck Next (3 of 3)
3rd attempt
Incorrect
Q = [H* (aq, x M)]³/(1 M)², so [H*] =v/(Q M)²)
pH = -log[H*]
Submit Answer
Retry Entire Group
9 more group attempts remaining
Transcribed Image Text:TUTOR Calculate pH Using the Nernst Equation A concentration cell consisting of two hydrogen electrodes (PH, = 1 atm), where the cathode is a standard hydrogen electrode and the anode solution has an unknown pH, has a cell voltage of 0.186 V. What is the pH in the unknown solution? Assume the temperature of the solutions is 298 K. pH = Submit Show Approach Hide Tutor Steps TUTOR STEP The equations for the anode and cathode reactions are in the they give proach. When summed 2 H*(aq, 1 M) =2 H*(aq, x M) which gives [H* (aq, x M)|_ [H*(aq, x M)]? [H* (aq, 1 M)]? (1 м)? Use this to solve for the unknown [H*] and the pH. Enter the pH value. pH = 8.3 ( Recheck Next (3 of 3) 3rd attempt Incorrect Q = [H* (aq, x M)]³/(1 M)², so [H*] =v/(Q M)²) pH = -log[H*] Submit Answer Retry Entire Group 9 more group attempts remaining
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