Expert Q&ADone15-10. Suppose that the Ag | A£CI outer electrode in Figure15-7 is filled with 0.1 M NaCl instead of saturated KCl. Sup-that the electrode is calibrated in a dilute buffer contain-poseing 0.1 M KCI at pH 6.54 at 25°C. The electrode is thendipped in a second buffer at the same pH and same tempera-ture, but containing 3.5 M KCI.(a) Use Table 15-3 to estimate the change in junction poten-tial and how much the indicated pH will change.(b) Suppose that a change in junction potential causes theapparent pH to change from 6.54 to 6.60. By what percentagedoes [H*] appear to change?Table 15-3 Liquid junctionpotentials at 25°CPotentialJunction(mVy0.1 M NaCl | 0.1 M KCI0.1 M NaCl | 3.5 M KCI1M NaCl | 3.5 M KCI0.1 M HCI | 0.1 M KCI0.1 M HCI | 3.5 M KCI-6.4-0.2-19+27+3.1a. A positive sign means that the right side of thejunction becomes positive with respect to the left side

Given: Ag/AgCl outer electrode is filled with 0.1 M NaCl instead of saturated KCl. Calibration of…

15-10. Suppose that the Ag | AgCl outer electrode in Figure 15-7 is filled with 0.1 M NaCl instead of saturated KCl. Sup- pose that the electrode is calibrated in a dilute buffer contain- ing 0.1 M KCl at pH 6.54 at 25°C. The electrode is then dipped in a second buffer at the same pH and same tempera- ture, but containing 3.5 M KCI.

15-10. Suppose that the Ag | AgCl outer electrode in Figure 15-7 is filled with 0.1 M NaCl instead of saturated KCl. Sup- pose that the electrode is calibrated in a dilute buffer contain- ing 0.1 M KCl at pH 6.54 at 25°C. The electrode is then dipped in a second buffer at the same pH and same tempera- ture, but containing 3.5 M KCI.

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

Chapter1: Chemical Foundations

Section: Chapter Questions

Problem 1RQ: Define and explain the differences between the following terms. a. law and theory b. theory and...

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Question

Expert Q&A
Done
15-10. Suppose that the Ag | A£CI outer electrode in Figure
15-7 is filled with 0.1 M NaCl instead of saturated KCl. Sup-
that the electrode is calibrated in a dilute buffer contain-
pose
ing 0.1 M KCI at pH 6.54 at 25°C. The electrode is then
dipped in a second buffer at the same pH and same tempera-
ture, but containing 3.5 M KCI.
(a) Use Table 15-3 to estimate the change in junction poten-
tial and how much the indicated pH will change.
(b) Suppose that a change in junction potential causes the
apparent pH to change from 6.54 to 6.60. By what percentage
does [H*] appear to change?
Table 15-3 Liquid junction
potentials at 25°C
Potential
Junction
(mVy
0.1 M NaCl | 0.1 M KCI
0.1 M NaCl | 3.5 M KCI
1M NaCl | 3.5 M KCI
0.1 M HCI | 0.1 M KCI
0.1 M HCI | 3.5 M KCI
-6.4
-0.2
-19
+27
+3.1
a. A positive sign means that the right side of the
junction becomes positive with respect to the left side

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