This week we are doing a web-based laboratory experiment titled Activity Series of Metals. The written materials for this experiment are available. These should be printed out before beginning the experiment. The experiment is written in Flash and can be accessed through either Internet Explorer or Netscape Communicator. If you have any difficulties accessing the Activity Series Simulation, please let dr. G know.
The completed write-up must be turned in by 4:45 pm at my office (PS155) on the day your laboratory meets. It should take approximately an hour or more to complete the simulation.
While you do not have to do a laboratory experiment in laboratory this week you are expected to attend the discussion/laboratory class. There will be an InClass activity to work on if the class does not have any questions over PS13. Also you are to check out of laboratory this week. Your TA will give you instructions about returning your laboratory equipment and your locker key. You must checkout before the last day of class or the Chemistry storeroom personnel will check you out and charge you for the checkout.
This week in laboratory you are doing Experiment 9: Potentiometric Determination of an Equilibrium Constant. In this experiment you will you a pH meter (potentiometric) to follow the pH in an acid-base titration. You know about neutralization equations, but you may not have thought about what happens to the pH as you add a base to an acid. This laboratory you will do that. Last week you performed a titration to check the amount of acetylsalicylic acid in a sample of aspirin. This week we are more interested in what happens during the titration.
You will begin the experiment by standardizing the sodium hydroxide solution you are using. You will sandardize the base using a substance call potassium acid phthalate, a primary standard. After standardizing the base, you will be given an unknown acid. You will titrate the unknown acid and from the titration curve determine the equilibrium constant of the acid.
There are several pre-laboratory questions for this experiment. We have not discussed enough acid-base equilibrium for you to answer parts d and e of question 1, but you can do the remaining questions. Question 5 is key to this experiment so look it over carefully.
This week in laboratory you are doing Experiment 4: THE PREPARATION OF ASPIRIN AND OIL OF WINTERGREEN: AN ORGANIC SYNTHESIS EXPERIMENT. There are pre-laboratory questions for this experiment. You must review the experimental procedure carefully. You will use acetic anhydride and concentrated sulfuric acid. These are hazardous chemicals. You must follow the instructions in the experiment. WEAR YOUR SAFETY GOGGLES.
This experiment is straight forward and you will be able to do the experiment and turn it in on the same day. There will also be time for discussion be sure to bring your questions to laboratory.
This week in laboratory you are doing Experiment 8: Photometric Determination of an Equilibrium Constant. This is a very cool experiment where you will actually collect data that will enable you to calculate an equilibrium constant for the reaction;
Fe3+(aq) + SCN-(aq)
FeSCN2+(aq)
There are several Pre-Laboratory Questions that must be completed before beginning the experiment. Students in Tuesday's and Wednesday's labs do not have to answer these questions before laboratory. I will need time on Wednesday in lecture to cover some sample problems like Q1 and Q3 on the PreLab Questions. Everyone will turn the Pre-Lab Questions in by Thursday at 5:30 pm, at my office.
In this experiment we will use the OceanOptics spectrometers to prepare a standard curve and to obtain the data for the equilibrium constant calculation. There are two basic parts of the experiment. While the two parts are fundamentally the same procedure, mix some reagents and measure the absorbance, they differ in the concentration of the reagents used. Read the laboratory experiment carefully. If you use the wrong reagents, your data will suck, and you will lose points on your lab write-up.
This week in laboratory we complete the second part of a two week laboratory titled Survial Organic Chemistry. Copies of the experiment are available as a draft version of this experiment. Take advantage of this week to practice alkane nomenclature and structural isomers, besides learning alkenes, alkynes, alcohols, carboxylic acids and amines. The second part of Survial Organic Chemistry will be covered on Exam III. Check out the InClass Activity Questions #1 and #2. I will have some additional questions for do to practice on during laboratory this week.
This week we are doing a cool kinetics experiment. You will study the reaction of crystal violet with sodium hydroxide, and determine the rate law for the reaction by measuring the change in concentration of crystal violet with time. We will use the OceanOptics spectrophotometers in PS241. These are very fancy spectrometers that are interfaced to computers. You should review the information about the equipment provided in the Experiment 7 write-up in your laboratory manual. There is additional basic information about spectrophotometers in Experiment 5.
There are several pre-lab question for this experiment so be sure to do those before arriving at discussion. I will probably have another inclass exercise ready for you, if there are no questions during discussion.
There are several plots which must be prepared for this experiment and it may not be possible to do those during the experiment itself. So the laboratory write-up does not have to be turned-in before leaving laboratory this week. However, it will have to be completed by 5:00 pm the second day following your scheduled laboratory meeting. So if you have laboratory on Monday, Tuesday or Wednesday your experimental write-up is due on Wednesday, Thursday or Friday (respectively) by 5:00 pm. The write-ups can be turned in in PS107 (see Glenda or Cheryl) or in the envelope on the wall outside Dr. G's office (PS155).
If you have any questions send me an e-mail or talk to your TA during laboratory.
This week in laboratory we start the first of a two week laboratory titled Survial Organic Chemistry. Copies of the experiment will be distributed in lecture during the second week of class. If you would like you can review a draft version of this experiment.
The first page of the experiment has several problems that must be completed BEFORE you arrive in your discussion/laboratory during on the September 18 and 19. Do these problems on a separate sheet of paper. Be sure to include your TA's name and your section number on the sheet. Bring extra paper to laboratory this week. All of your notes/work will have to be recorded on separate sheets of paper from the laboratory experiment. Be organized as you work these next two weeks. Some of the points for this experiment will be awarded based upon on the organization, clarity of your experimental write-up. If you have questions talk to your TA.
See the links in the Week of September 17th laboratory.
This week we are doing Experiment #5 in the CHEM 1515 Laboratory Manual. There are pre-laboratory questions. Be sure to have those done BEFORE coming to discussion/laboratory. Also come prepared to ask questions over PS#4. If you have no questions there will be an InClass Activity for you to work on and turn in. We are using the Spec20 Spectrometer which is different than the OceanOptics Spectrometer described in the CHEM 1515 Laboratory Manual in Experiment #5. Copies on how to use the Spec20 will be distributed in laboratory. If you would like a pre-release of the handout get it here.
This week in laboratory we start the first of a two week laboratory titled Survial Organic Chemistry. Copies of the experiment will be distributed in lecture during the second week of class. If you would like you can review a draft version of this experiment.
It is a two week experiment but we will only work on it in laboratory during the Week of September 17th. The second part of the experiment will be completed at various times during the semester as homework assignments, or in discussion.
The first page of the experiment has several problems that must be completed BEFORE you arrive in your discussion/laboratory during on the September 18 and 19. Do these problems on a separate sheet of paper. Be sure to include your TA's name and your section number on the sheet. Bring extra paper to laboratory this week. All of your notes/work will have to be recorded on separate sheets of paper from the laboratory experiment. Be organized as you work these next two weeks. Some of the points for this experiment will be awarded based upon on the organization, clarity of your experimental write-up. If you have questions talk to your TA.
Organic chemistry is covered in Chapter 15 of Silberberg. Here are some notes covering the organic chemistry that may help you in this experiment. Please be aware that we will be covering other material in lecture while doing the survival organic chemistry laboratory experiment. You will be responsible for the material covered in laboratory on Exam I. I also recommend you read sections 15.1 , 15.2 and 15.4 in Chapter 15 of your textbook.
Notes: Introduction to Organic Chemistry...alkanes, nomenclature of alkanes, and structural isomers; (sections 15.1 and 15.2)
Notes: Introduction to Organic Chemistry...condensed formulas and Lewis structures; (section 15.1 and 15.2)
Notes: Introduction to Organic Chemistry...alkenes, nomenclature of alkenes, geometric isomers and alkynes; (section 15.2)
Notes: Introduction to Organic Chemistry...important functional groups. (section 15.4).
You will be responsible for alkanes (nomenclature, formulas, and structural isomers) on a future Exam. Review section 15.1 and 15.2 pages 604 - 615.
During WEEK 2 of the Qualitative Cation Analysis you will test your separation scheme with a known which you prepare, then after checking with your TA, you will be able to test an unknown.
Monday students will begin the first week of the Qualitative Cation Analysis laboratory this week and complete the experiment on Monday, September 17th. (See the information for Week One of this experiment above.)
This week we will do cation qualitative analysis.
Before arriving in laboratory you must complete the Pre-laboratory question in Experiment #2 in your CHEM 1515 laboratory manual. The procedure portion of Exp #2 in the CHEM 1515 lab manual is NOT the procedure we will follow this week.
The actual experiment we will do is different from what is in your laboratory manual. I will distribute the laboratory in class on Friday, August 31, 2001.
This version of Qualitative Cation Analysis is a TWO WEEK laboratory. The first week we will get as far as collecting all the observations for the different reactions, writing the chemical equations to symbolically represent the reactions and answer the three questions about how to identify the presence or absence of the cations.
THis is a great experiment as it introduces you to a number of interesting chemical reactions. Question #1 and #2 on each of my exams is over reactions. So I strongly encourage you to know all of the reactions that occur in this experiment.
Review Problem Set.
NOTE: If you missed laboratory during the week of August 20 - 24 you must view the Safety Videotape this week. No student can do experiments until the Safety video has been watched and the Safety Quiz taken. See your TA to find out the procedure to view the Safety videotape.
Introduction to the laboratory, Safety and Review Problem Set