The measurement of pH using a glass electrode obeys the Nernst equation. The typical response of a pH meter at 25 00°C is given by the equation where 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 = 0.250 V and that a. What is the uncertainty in the values of pH and [H + ] if the uncertainty in the measured potential is ±1 m V (± 0.001 V)? b. To what precision must the potential be measured for the uncertainty in pH to be ± 0.02 pH unit?
The measurement of pH using a glass electrode obeys the Nernst equation. The typical response of a pH meter at 25 00°C is given by the equation where 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 = 0.250 V and that a. What is the uncertainty in the values of pH and [H + ] if the uncertainty in the measured potential is ±1 m V (± 0.001 V)? b. To what precision must the potential be measured for the uncertainty in pH to be ± 0.02 pH unit?
Solution Summary: The author defines cell potential as the measure of energy per unit charge available from the redox reaction to carry out the reaction.
The measurement of pH using a glass electrode obeys the Nernst equation. The typical response of a pH meter at 25 00°C is given by the equation
where 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 = 0.250 V and that
a. What is the uncertainty in the values of pH and [H+] if the uncertainty in the measured potential is ±1 m V (± 0.001 V)?
b. To what precision must the potential be measured for the uncertainty in pH to be ± 0.02 pH unit?
An einstein is the amount of energy needed to dissociate 1 mole of a substance. If we have 0.58 moles, do we need 0.58 einsteins to dissociate that substance?
If the energy absorbed per mole of gas is 480 kJ mol-1, indicate the number of Einsteins per mole.Data: Energy of each photon: 0.7835x10-18 J.
If the energy absorbed per mole of gas is 480 kJ mol-1, indicate the number of Einsteins per mole.
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Author:Steven D. Gammon, Ebbing, Darrell Ebbing, Steven D., Darrell; Gammon, Darrell Ebbing; Steven D. Gammon, Darrell D.; Gammon, Ebbing; Steven D. Gammon; Darrell
Author:Steven D. Gammon, Ebbing, Darrell Ebbing, Steven D., Darrell; Gammon, Darrell Ebbing; Steven D. Gammon, Darrell D.; Gammon, Ebbing; Steven D. Gammon; Darrell