CHEMISTRY 31 - QUANTITATIVE ANALYSIS
Meeting time, place:
Lecture 11:00 to 11:50, Monday and Wednesday, Sequoia 301; Laboratory Sequoia 446
Lecture: Dr. Roy Dixon (office Sequoia 446C, phone 8-6893, email: email@example.com)
Laboratory: Section 2 (MW 8:00 - 10:30) Dixon, Section 3 (MW 12:00 2:30) Dr. Jahansooz Toofan/Dr. Justin Miller-Schulze, Section 4 (MW 3:00-5:30) Dr. Jahansooz Toofan, Section 5 (TuTh 8:00-10:30) Dr. Jahansooz Toofan, Section 6 (TuTh 11:00-1:30) Ms. Heidi Van Atta
Lab instructor contact information will be posted on website
Emphasis of Course Content:
Lecture - Principles and application of chemical equilibria; measurements and associated statistics; titrations; introduction to spectroscopy and chromatography.
Laboratory Mastering equipment for quantitative handling of chemicals; learning high precision analytical methods; handling of samples; introduction to spectroscopy and chromatography for quantitative analysis; application of statistics; introduction to report writing.
Texts: Harris, Quantitative Chemical Analysis, 9th edition (Note, you may use an earlier edition of the text, but you are responsible for any differences); For lab, Chemistry 31 Laboratory Manual
Tentative Lecture Schedule (Amount of material covered may change slightly but test dates are rarely changed. Chapters in italics are "review" chapters. Parts of other chapters also are review items):
Measurements; Errors (Ch. 3) Jan. 30 46-60
Errors; Statistics (Ch. 4) Feb. 6 64-81
Equilibria (Ch. 6) Feb. 20 124-139
Equilibria (Ch. 6), Titrations (Ch. 7) Feb. 27 145-149
Exam 1 (Ch. 1, 3, 4, 6) Mar. 6
Titrations (Ch. 7) Mar. 6 149-154
Spectroscopy (Ch. 18); Chromatography (Ch. 23) Mar. 13 433-437; 604-606
Spring Break Mar. 20
Chromatography (Ch. 23) Mar. 27 609-620
Advanced Equilibria, Acid-Base Equilibria (Ch. 9) April 3 161-182; 188-190
Advanced Equilibria, Acid-Base Equilibria April 10 190-206
Acid-Base Equilibria April 17 188-195
Exam 2 (Ch. 7, 8, 9.1, 18, and 23) April 19
Polyprotic acids (Ch. 10) April 24 211-225
Acid-Base Titrations (Ch. 11) May 1 233-238
Acid-Base Titrations (Ch. 11), Catch up May 8 238-251
Final Exam (cumulative) May 15 10:15-12:15
Posted Information (homework solutions, example exams, assignments, lecture notes):
At website (http://www.csus.edu/indiv/d/dixonr/C31/C31.htm) or on SacCT
Tentative office hours: Mon 12:00-1:00, Tues. 11:00-12:00, Fri. 9:00-10:00. The office hours for the other lab instructors will be posted online.
Attendance: Attendance in the lecture will not be taken. However, it is to your benefit to attend the lectures and quizzes can not be made up. In the lab, the instructors reserve the right to drop students who miss too many lab meetings, who fall behind because of attendance problems, or who are consistently late to lab. All students in labs must attend a safety presentation.
The lecture score will account for 55% of the total score with the remainder (45%) from the lab.
2 midterms (100 points each)
Cumulative final exam (150 points; ~50% review)
Exams missed due to exceptional circumstances can be made up on the day of the final exam.
Quizzes (50 points total)
There will be six quizzes (five that count and each worth 10 points). You will be able to drop your lowest quiz score. The first graded quiz will be the diagnostic quiz, with the score based on the "resubmitted" quiz (You get a chance to correct wrong answers).
Homework (20 points total). Text homework problems will be assigned but not collected. There will be four additional homework assignments on more challenging topics: propagation of uncertainty, least squares regression using Excel, advanced equilibria, and buffer calculations.
Laboratory Reports (85 pts) + 2 bonus points for meeting High Quality Report criteria
Laboratory Notebook Grading (10 pts)
Lab Procedures Quiz (5 pts)
More details of the laboratory grading is provided at the bottom of the section: laboratory report grading schedule
Assignment of grades:
The break-down of grades will depend on the class average (in other words be curved), but a higher class average will result in more high grades. The following grading scheme (excluding +s and s) can be considered typical although higher cut-offs are not expected:
A 90 100%
B 78 90%
C 66 78%
D 55 66%
NOTE: There is a minimum score requirement of at least 50% in both the lecture and laboratory sections to get a grade of C- or above.
Cheating in class: Student caught cheating during quizzes or exams, falsifying lab data, or plagiarizing reports will be subject to punishment. If you have questions on what constitutes plagiarism, see the instructor. Punishment may range from receiving a zero on the quiz/exam to expulsion from the university (see http://www.csus.edu/umanual/AcademicHonestyPolicyandProcedures.htm).
Prerequisites: Pass Chem 1A and 1B or equivalent with grade of C- or better. Be prepared to show proof that you have met the prerequisites in lab.
Laboratory Report Grading Schedule:
Laboratory Experiment Report Due Date Grading Tolerance#
1. Calibration of Buret/Pipet Feb. 13 2 pts N/A (0.1)
2. Chloride Lab Mar. 8 11 pts 0.3 (0.5)
3. Water Hardness Lab Mar. 15 10 pts 0.5 (1)
4. Atomic Absorption Spectroscopy April 12 12 pts 8/4 (Mg/Ca)$
5. Ion Chromatography April 19 10 pts 5
6. Spectrophotometric Analysis May 1 10 pts 2.5 ea. compound
7. Formal Water Report part A April 17 5 pts N/A
7. Formal Water Report part B May 8 5 pts N/A
8. Soda Ash Lab Formal Water Report May 12* 10 pts 0.5 (0.5)
9. GC May 12* 10 pts 2.5
*It is recommended that you turn in these lab reports earlier in case you make any calculation errors.
#See notes 4 and 5 below for the meaning of the tolerance scale.
$8% tolerance is given for Mg vs. a 4% tolerance for Ca due to lower Mg concentrations.
1. Laboratory experiments must be turned in by the due date to receive full credit. If laboratory reports are not completed or are in an incorrect format (see Appendix I of lab manual for correct format), they will be returned without grading. Report due dates are roughly based on one week past the last day expected for in-lab work and may be postponed. The penalty for late lab experiments is 2 points off for each week late for a maximum of two weeks late. Lab reports turned in after May 12 (including recalculations/resubmissions) receive zero credit. Also, some reports require calculations using a computer, so it is suggested that you try to do the calculations at least a few days before the deadline.
2. Lab report formats: Refer to Appendix I of the lab manual for the correct format of each lab report. Data sheets or photocopies of carefully organized lab notebook tables are needed for most reports. Reports 2, 4 and 6 require turning in a computer-generated spreadsheet (see example spreadsheets in the lab manual). The formal lab report (number 7) will be a 3 to 5 page written report of the analysis of the tap water sample in the atomic absorption spectroscopy and the ion chromatography labs. This report will be graded based on the writing quality and content. This will be submitted in two parts (introduction and experimental methods for Part A and results and discussion for Part B) to allow you to get feedback to improve writing.
3. Grading will be based on precision (2 points each for labs 1, 2, 3, 4 and 8) and accuracy (remainder of points for labs 2, 3, 4 and 8 and all of the points in 5, 6, and 9).
4. Grading for accuracy will be based on the percent error calculated from the reported value and the true value. A full score will be received if the percent error is less than a tolerance value (1st value shown above). Percent errors larger than the tolerance will result in loss of points. For example, an experiment has a 0.5 % tolerance and a student's percent error is 1.2%, that student would receive an 8.6 or a loss of 1.4 points for being 0.7% past (1.4 times) the tolerance limit. There will be a minimum accuracy score of 40% of the points for completed reports.
5. Grading for precision will be based on reported uncertainty. If your percent uncertainty is less than the value listed in parentheses under tolerance, you will receive full credit. For lab 4, you receive full precision points by correctly calculating the uncertainty associated with each measured concentration; the actual uncertainty value will not affect your grade.
6. If it appears likely a poor score was the result of an incorrect calculation or if the initially submitted lab report was incomplete (and returned without grading), the report may be corrected and resubmitted. The new report must be attached to the originally submitted report, must be resubmitted within two weeks of the original deadline (first 5 labs) or by May 12th (last labs), and can only be resubmitted once for each experiment. You may not resubmit the formal lab report.
7. If you receive a low score, you may repeat one experiment if time permits. However, students are limited to only one "free" replacement unknown request (subsequent unknown requests will be taken with a 2 point penalty). No unknown request can be made after May 1st.
8. Laboratory notebooks will be collected at random during the semester and graded for a total of 10 points. It will be graded on 1) correct formatting (table of contents, page numbers, etc.), 2) inclusion of pre-lab calculations needed for current laboratory exercise, 3) a reasonable attempt to keep data organized, and 4) data entered correctly.
9. The laboratory procedures quiz (5 pts) will be given on the fourth meeting of the lab (Feb. 1st or 2nd) and be focused on reading the first 16 pages of the lab manual and the class syllabus (this document), understanding how lab grading is done, and on following safety and procedural information given in the lab lectures during the first week.
10. As added incentive for students to turn in lab reports in the correct format the first time, 2 bonus points will be available for any student that: 1) submits all lab reports on time, 2) does not resubmit any lab report, 3) receives a score of at least 50% of available accuracy and at least 50% of available precision points for every lab report (excluding the formal lab report). This is the High Quality Report criterion mentioned in the grading section.