Calibration data for a bromide ion-selective electrode (ISE) was collected and [Br¯] (M) Potential (mV) recorded in the table. The potential of the ISE was measured against a saturated 0.300 -21.1 calomel electrode (SCE). All solutions were buffered at a pH of 7.56. A linear 0.0300 36.7 calibration curve can be constructed from this data as a plot of potential (in mV) vs. pBr. Determine the slope and y-intercept of such a plot of the calibration 0.00300 95.5 data given. 0.000300 154.7 0.0000300 225.7 slope = mV у-intercept mV Two unknown solutions were tested for [Br¯] using the same bromide ISE. The potential reading for unknown 1 was 19.5 mV, and the potential reading for unknown 2 was 185.2 mV. Using the calibration curve you constructed, determine the concentration of Br¯ in each unknown solution. unknown 1 [Br¯] = M unknown 2 [Br¯] = M

Calibration data for a bromide ion-selective electrode (ISE) was collected and [Br¯] (M) Potential (mV) recorded in the table. The potential of the ISE was measured against a saturated 0.300 -21.1 calomel electrode (SCE). All solutions were buffered at a pH of 7.56. A linear 0.0300 36.7 calibration curve can be constructed from this data as a plot of potential (in mV) vs. pBr. Determine the slope and y-intercept of such a plot of the calibration 0.00300 95.5 data given. 0.000300 154.7 0.0000300 225.7 slope = mV у-intercept mV Two unknown solutions were tested for [Br¯] using the same bromide ISE. The potential reading for unknown 1 was 19.5 mV, and the potential reading for unknown 2 was 185.2 mV. Using the calibration curve you constructed, determine the concentration of Br¯ in each unknown solution. unknown 1 [Br¯] = M unknown 2 [Br¯] = M

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

Calibration data for a bromide ion-selective electrode (ISE) was collected and
[Br¯] (M)
Potential (mV)
recorded in the table. The potential of the ISE was measured against a saturated
0.300
-21.1
calomel electrode (SCE). All solutions were buffered at a pH of 7.56. A linear
0.0300
36.7
calibration curve can be constructed from this data as a plot of potential (in mV) vs.
pBr. Determine the slope and y-intercept of such a plot of the calibration
0.00300
95.5
data given.
0.000300
154.7
0.0000300
225.7
slope
mV
у-intercept
mV
Two unknown solutions were tested for [Br¯]using the same bromide ISE. The potential reading for unknown 1 was
19.5 mV, and the potential reading for unknown 2 was 185.2 mV. Using the calibration curve you constructed, determine
the concentration of Br in each unknown solution.
unknown 1 [Br¯] =
M
unknown 2 [Br¯] =
М

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