Problem Sets

Chem 102, Fall 2003

Skoog, West, Holler, and Crouch, Fundamentals of Analytical Chemistry, 8th Ed.

Except for some problems as noted, you are asked to do the (*) questions that have the answers (but not the solutions) in the back of the book.

Basic 1

Ch 4, p. 87, Calculations Used in Analytical Chemistry

4-7 find moles given grams

4-9 find millimoles given solutions

4-11 find mg given moles

4-13 find mg given solutions

4-14 find g given solutions

4-19 find M and p given ppm and density

4-25 prepare solutions

4-29 prepare solutions

4-37 reacting reagent amount

SS Assignment 01

Formulas and Plotting. See handout on website. Ch 3 has some limited info on using Excel.

Grav1

Ch 12, p. 334, Gravimetric Methods

12-10 one-step grav calc

12-18 grav from series of reactions

12-22 grav from series of reactions

12-24 minimum-maximum grav

12-28 two-component grav

Stat 1

Ch 5, p. 103, Errors in Chemical Analysis

5-10 calc % relative error

5-9 calc amount given relative error

Ch 6, p. 139, Random Errors in Chem Analy

6-7 mean, median, range, s, CV (s/mean x 100%)

6-17 pooled s

Stat 2

Ch 7, p. 170, Statistical Data Treatment & Eval

7-4 95% CL of data (not mean)

7-5 95% CL of data, sigma vs. s

7-6 Q test (no ans in back)

7-7 CL of mean, given N

7-9 calc N, given CL

7-11 CL of mean given s or sigma

7-16 t-test for two means (no ans in back)

SS Assignment 02: Linear Least Squares

Ch 8C, p. 221, Standardization & Calibration

8-15 Use Excel example on p. 202 or Model LLS from my website. Omit ANOVA.

Ksp1

Ch 9B-5 Applying Ksp, p. 264

9-8 write Ksp expressions

9-9 Ksp in terms of s (no ans in back)

9-10 calc Ksp from s

9-11 calc s with common ion (no ans in back)

9-13 conc to start ppt

9-15 mixture problems (use I/F SS method from class)

Ionic 1

Ch 10, Effects of Electrolytes on Chemical Equilibria, p. 279

10-7 compute ionic strength

10-8 compute activity coeff

10-10 do Ksp calc w. activites

Ksp2

Ch 11, Equilibria in Complex Systems, p. 309

11-4 mass balance expressions

11-5 charge balance expressions

11-11 s of PbCO3 given pH (see example p. 291 and my website)

AB1 (WA, WB, SA, SB)

Ch 9, Aqueous Solutions and Chemical Equilibria, p. 264

9-4 ID conj. acids and bases

9-6 autoprotolysis expressions

9-7 AB eq. const. expresssions

9-20 pH of WA & WB

9-21 ph of WA & WB

Ch 14, Principles of Neutralization Titrations, p. 391

14-15 very dilute SB

14-19 pH of SA w. activity

14-20 pH of WA

14-21 pH of WB

AB2 (buffers)

Ch 9, Aqueous Solutions and Chemical Equilibria, p. 265

9-26 choose A/B pair given pH

9-27 base plus acid to get pH

9-29 SA plus WB to get pH

Ch 14, Principles of Neutralization Titrations, p. 392

14-29 WA SB mixture

14-32 pH of buffer prep

14-37 pH of SA plus buffer

AB3 (monoprotic titrations curves and alphas)

Ch 14, Principles of Neutralization Titrations, p. 393

14-38 SA SB curve

14-41 SB WA curve

14-42 SA WB curve

14-44 alpha0 and alpha1 of WA

AB4 (polyprotic)

Ch 15, Complex A/B Systems, p. 425

15-6 end points of various polyprotics

15-7 pH of poly acids

15-8 pH of amphiprotics

15-9 pH of poly bases and amphiprotics

15-10 pH of poly buffers

15-16 calc buffer given pH

15-26 SS poly titrations curves (no ans in back)

15-31 SS compute alphas

AB5 (messy A/B applications)

Ch 16, Applications of Neutralization Titrations, p. 445

16-29 air sample back titration

16-37 plant food by Kjeldahl

CF1 (messy titrations)

Ch 17, Complexation Reactions and Titrations, p. 484

17-21 Fe(II) and Fe(III) mixture

17-23 Pb and Cd mixture

17-25 Zn and Fe mixture

CF2 (equilibrium and titr curve)

Ch 17, Complexation Reactions and Titrations, p. 485

17-31 conditional Kf

17-32 Sr w. EDTA curve (SS, no ans in back)

Spec 1 (%T and Beer’s Law)

Ch 24, Intro to Spectro, p. 740

24-18 complete abC, %T, etc table

24-22 A of diluted sample

24-24 A, T, C, b of colored complex

24-25 Effect of stray light

Ch 25, Instruments for Spectro, p. 782

25-23 SS spectrum from diode array data (not in back)

Spec 2 (Working curves by LLS spreadsheet)

Ch 24, Intro to Spectro, p. 741

24-27 SS LLS workup w. error analysis

24-28 SS LLS workup w. error analysis (not in back)

Ch 26, Molecular Absorption Spectro, p. 823

26-32 SS Spectro Hg in soil

Ch 28, Atomic Spectroscopy, p. 872

28-15 AAS of Pb in blood

EC1 (balance redox reactions)

Ch 18, Intro to Electrochem, p. 519

18-7 balance reactions

18-11 write balanced half reactions

18-12 write half reactions, then rank (not in back)

EC2 (Nernst Equation)

Ch 18, Intro to Electrochem, p. 519

18-13 Cu electrode in solutions

18-16 Pt electrode in solutions

18-18 anodes and cathodes

Redox1 (cell potentials and titration curves)

Ch 19, Applications of Electrode Potentials, p. 556

19-8 calc Nernst cell potentials

19-15 calc redox titration curves

Redox2 (messy volumetric redox calcs)

Ch 20, Applications of Redox Titrations, p. 583

20-28 permanganate standardization vs. oxalate

20-30 generate I2, then titrate

20-32 Sb in ore, I2 method

20-43 back titration and I2

20-49 SO2 gas analysis

ISE (conc from potentials)

Ch 21, Potentiometry, p. 630

21-19 calc pAnalyte given E

21-21 calc pH given std E

21-79 SS-F by ISE, LLS working curve (not in back)

SEP (extraction and chromatography calcs)

Ch 30, Intro to Separations, p. 943

30-13 Liquid-liquid extraction

Ch 31, Gas Chromatography, p. 971

31-21 SS to find % of components