The measurement of pH using a glass electrode obeys the
Chapter 18, Problem 141(choose chapter or problem)
The measurement of pH using a glass electrode obeys the Nernst equation. The typical response of a pH meter at 25.00C is given by the equation where eref contains the potential of the reference electrode and all other potentials that arise in the cell that are not related to the hydrogen ion concentration. Assume that eref 0.250 V and that emeas 0.480 V. a. What is the uncertainty in the values of pH and [H] if the uncertainty in the measured potential is 1 mV ( 0.001 V)? b. To what precision must the potential be measured for the uncertainty in pH to be 0.02 pH unit?
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