Principles of Instrumental Analysis
7th Edition
ISBN: 9781305577213
Author: Douglas A. Skoog, F. James Holler, Stanley R. Crouch
Publisher: Cengage Learning
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Chapter 25, Problem 25.12QAP
Interpretation Introduction
(a)
Interpretation:
The slope, intercept, regression statistics including the standard deviation about regression should be calculated.
Concept introduction:
Concentration Dopamine take as the dependent variable and Peak current take as the independent viable.
Concentration of Dopamine take to y axis and Peak current take to x axis.
Interpretation Introduction
(b)
Interpretation:
The concentration of dopamine at peak current 2.92 nA should be calculated using the plotted graph.
Concept introduction:
The graph is plotted by taking dopamine concentration as dependant variable and peak current as independent variable.
Therefore, for the given peak current can find the dopamine concentration using the trend line equation.
Interpretation Introduction
(c)
Interpretation:
Standard deviation of the unknown concentration should be calculated.
Concept introduction:
Standard deviation will give that the deviation of the value from the average.
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Students have asked these similar questions
The sensitivity of a coulometer is governed by the delivery of its minimum current for its minimum time. Suppose that 5 mA can be delivered for 0.1 s.(a) How many moles of electrons are delivered at 5 mA for 0.1 s? (b) How many milliliters of a 0.01 M solution of a two-electron reducing agent are required to deliver the same number of electrons?
Write the applications of the glass electrode. (Please write it correctly and concisely.)
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
Chapter 25 Solutions
Principles of Instrumental Analysis
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