Sart Data End Data Sart Data End Data Sart Data End Data Sart Data End Data Sart Data
End Data Sart Data End Data Sart Data End Data Std. Name.
Standard 1
Standard 2
Standard 3
Standard 4
Standard 5
Sample
(y-b)/m
Dil Sa: (y-b)/m
100 ppm
200 ppm
300 ppm
4
Data Handling #2
1. Z & T Statistics
2. Detection of Gross Errors
3. Hypothesis Testing
Quantitative Analysis | Lecture 7
Confidence Interval (CI)
()
=
Image: AC Figure 3.2, Table: Skoog AC
2
Calculate the 95 % CI for the mean of a sample that
yielded
Data Handling
1. Definitions
2. Sources & Types of Errors
3. Statistics
Quantitative Analysis | Lecture 6
Replicate determination of iron in a 20.0 ppm
iron(III) solution
= =
=
Image: Skoog AC
2
Replicate determination of iron in a 20.0 ppm
iron(III) s
CHEM 321 | Homework #3
Gravimetric Analysis
1.
A solution of a mixture of Na2CO3 and KCl is quantitatively precipitated using a large
excess of AgNO3 to form Ag2CO3 and AgCl. The corresponding solubility products are
as follows:
Ksp(Ag2CO3) = 8.1 10-12
Ks
Volumetric
Analysis
QCA #7
Quantitative Analysis | Lecture 3
1
Gravimetric Analysis
Weight of a pure compound to which
the analyte is chemically related.
Volumetric Analysis
Quantity of reagent of known
concentration needed to react
completely with analyt
CHEM 321
Quantitative Analysis
Homework 2 Solutions
1.
The concentrations must simultaneously obey two heterogeneous equilibria:
Ksp(Ag2CO3) = [Ag+]2[CO3] = 8.1 10-12
Ksp(AgCl) = [Ag+][Cl] = 1.1 10-10
where [Ag+] is a common ion in large excess. The relat
CHEM 321 | Homework #4
Volumetric Analysis
1.
A 10.231-g sample of a window cleaner containing ammonia was diluted with 39.466 g of
water. Then 4.373 g of solution was titrated with 14.22 mL of 0.1036 M HCl to reach a
bromocresol end point. What is the we
CHEM 321 | Homework #1
Math Skills
CHEM 321 involves extensive problem solving that requires mastery of some math
operations. A few typical examples are given below for you to practice. Exams will be
extremely difficult without good skills in working out
volume
pH
dpH/dv
S(dv)
S(d(Sdv) d2pH/dv2
dpH/dv EPmax 2nd deriv 2nd deriv
min
V*10^-pH gran x
gran y
gran x^2 gran x*y
N
gran x fit gran y fit
0
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This spreadsheet is useful for plotting data that is expected to have a linear
relationship between two variables or their log functions. Enter measured
results in the Y column and standard concentrations in the X column. The log of
each will be displayed
For each sample as the spectrometer readings flucuated I recorded the high and low values I saw then took the average to calculate the abs vs conc line plotted.
Leaving the absorbance value of the least concentrated sample the same I adjusted the next hig
Volumetric
Analysis 2
QCA #10,11
Quantitative Analysis | Lecture 4
1
From Last Time
Homework: Sketch a titration curve
for a 20 mL solution of 0.100 M
benzoic acid titrated with a 0.200 M
solution of NaOH. Calculate the pH
of the beginning, equivalence,