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Amperometry, Coulometry, Aquametry
I. Current = charge/unit time. Charge = integral of currents. Amperometry: current
proportional to instantaneous flux of analyte to electrode. Coulometry: charge proportional to
total amount
Elemental Analysis
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Elemental Analysis
I. X-rays, UV/visible line emission, UV/visible line absorption, Ions/mass spectrometry, and why
titration, gravimetry, spectrophotometry and electrochemistry rarely are competitive in industrialized
socie
Spectroscopy Introduction
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Introduction to Spectroscopy
I. The basic relationships: E = h = hc/ = c. Wavenumber:
.
II. Units: wavelength in meters, mm, micrometers, nanometers, Angstroms. Wavenumber in cm-1 or m -1 (Kaysers).
Power in photons s
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Applied Spectrometry: Bioanalysis
I. Simultaneous Multispecies Spectroscopy
A. Simultaneous equations
1. One wavelength for each component. No statistical redundancy.
Two Components
N Components
2. Isosbestic points for norma
Take Home Assignment #2 Key
Please turn in neatly worked solutions for the following problems. Answers are due by
4:00 PM on Monday, September 3rd.
These problems provide a review basic equilibrium calculations from Chem 260. All
reactions involve gases o
Take-Home Assignment #8
Please turn in neatly worked solutions for the following problems by 4:00 PM on
Monday, October 22nd.
1. One method for determining the amount of magnesium hydroxide in Milk of Magnesia
(MOM) is to dissolve a portion in a solution
Take-Home Assignment #8
1. One method for determining the amount of magnesium hydroxide in Milk of Magnesia
(MOM) is to dissolve a portion in a solution of HCl. The resulting Mg2+ is then
precipitated as MgNH4PO4. After filtering, the precipitate is heate
Take-Home Assignment #5
Please turn in neatly worked solutions for the following problems. Answers are due by
4:00 PM on Wednesday, September 19th.
The intention of these problems is to provide additional experience in solving equilibrium
problems by focu
Take-Home Assignment #5 Key
The intention of these problems is to provide additional experience in solving equilibrium
problems by focusing on verifying assumptions and activity effects. Thermodynamic
equilibrium constants (i.e. for = 0) for all reactions
Take-Home Assignment #4
Please turn in neatly worked solutions for the following problems. Answers are due by
4:00 PM on Wednesday, September 12th.
The intention of these problems is to provide experience in solving equilibrium problems.
Equilibrium const
Take-Home Assignment #4
The intention of these problems is to provide experience in solving equilibrium problems.
Equilibrium constants for all reactions may be found in the Appendices. Use ladder
diagrams to help you simplify equilibrium problems.
1. Cal
Take-Home Assignment #9
Please turn in neatly worked solutions for the following problems. Feel free to work with
one partner, in which case you may submit one set of solutions. Turn in your answers by
Friday, April 8th.
The intention of this assignment i
Take-Home Assignment #9
The ligand 8-hydroxyquinoline, C9H6(OH)N, also known as oxine, is amphoteric. If we
represent its neutral form as BH, then oxine may be protonated (at the nitrogen) to form
the cationic species BH2+ at more acidic pH levels, and ma
Take Home Assignment #1
Please turn in neatly worked solutions for the following problems. Answers are due by
4:00 PM on Friday, August 31st.
1. Erythrosin B (which we will abbreviate as EB) is a dye with many analytical uses,
including a biological stain
Take Home Assignment #1 Key
Please turn in neatly worked solutions for the following problems. Answers are due by
4:00 PM on Friday, August 31st.
1. Erythrosin B (which we will abbreviate as EB) is a dye with many analytical uses,
including a biological s
Take-Home Assignment #7
Please turn in neatly worked solutions for the following problems. Turn in your answers
by Wednesday, October 10th.
1. Solutions of perchloric acid, HClO4, may be standardized by titrating against a
primary standard of sodium carbo
Take-Home Assignment #7
1. Solutions of perchloric acid, HClO4, may be standardized by titrating against a
primary standard of sodium carbonate, Na2CO3. Typically, the titration is carried out
to the carbonate ions second endpoint. Suggest a mass of Na2CO
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Introduction to Electrochemistry
I. Since chemistry is what happens when we make and break bonds and
since bonds are made of electrons and
since electrochemistry deals with additions of or removal of electrons from molecules
Kinetics Methods
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Kinetics Methods of Analysis
I. Why use rates instead of waiting for equilibrium?
A. Selectivity - can sense fastest reacting components in the presence of slower
reacting interferences.
B. Save time.
C. Importance of detected
Capillary Electrophoresis
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Capillary (and a bit of Planar) Electrophoresis
I. Ionic motion, in vacuum vs. subject to viscous drag. Stokes-Einstein diffusion:
. Viscosity in poise, mobility in cm2V-1s-1. Diffusion coefficient relates to mobility
Analyticalchemistrytopics
Qualitative and quantitative chemical analysis is concerned with the analyte present in a chemical sample Chemical analysis involves:
identification of the analyte determination of the quantity of the analyte
separation of indi
ACIDBASEEQUILIBRIA
a HA
K 0.01c
Ka = 1.75 x 10-5
Weakacidsandbases(quantitativeaspects):
The reaction substrates and products are in equilibrium, and are linked by the equilibrium equation:
Ka HA + H O H O+ + A 2 3 [H O+ ][A ] Ka = 3 [HA]
where Ka is the
Take-Home Assignment #6
Please turn in neatly worked solutions for the following problems. Answers are due by
4:00 PM on Monday, October 8th.
1. Calculate and graph the exact titration curve for 50.0 mL of 0.025 M hypochlorous
acid with 0.050 M NaOH. Be s
Take-Home Assignment #6
1. Calculate and graph the exact titration curve for 50.0 mL of 0.025 M hypochlorous
acid with 0.050 M NaOH. Be sure to calculate the initial pH, the pH for at least 4
points before the equivalence point, the pH at the equivalence
Take-Home Assignment #10
Please turn in neatly worked solutions for the following problems before leaving for the
Thanksgiving break.
Shown on the reverse is a hypothetical chromatogram for a mixture of nine compounds
(time is given in minutes). Assume th
Take-Home Assignment #10 Answer Key
1. Shown below is a table summarizing my measurements for retention times and peak
widths; note that these retention times are rounded to the closest 0.1 mm and that
peak widths are rough estimates, particularly for pea
Take Home Assignment #3
Please turn in neatly worked solutions for the following problems. Answers are due by
4:00 PM on Wednesday, September 5th.
These problems provide experience in drawing and working with ladder diagrams. See
Appendix 3B for a list of