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?
Question 4
Determine the rate order and rate constant for sucrose hydrolysis.
Time (hours)
[C6H12O6]
0
0.501
0.500
0.451
1.00
0.404
1.50
0.363
3.00
0.267
First-order, k = 0.210 hour 1
First-order, k = 0.0912 hour 1
O Second-order, k =
0.590 M1 hour 1
O Zero-order, k = 0.0770 M/hour
O Zero-order, k = 0.4896 M/hour
O Second-order, k = 1.93 M-1-hour 1
10 pts
Determine the rate order and rate constant for sucrose hydrolysis.
Time (hours)
[C6H12O6]
0
0.501
0.500
0.451
1.00
0.404
1.50
0.363
3.00
0.267
Draw the products of the reaction shown below. Use wedge and dash bonds
to indicate stereochemistry. Ignore inorganic byproducts.
OSO4 (cat)
(CH3)3COOH
Select to Draw
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Biochemistry: Concepts and Connections (2nd Edition)
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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