http://ochemonline.pbwiki.com/ Find Out What's Happening in Organic Chemistry Lab en http://ochemonline.pbwiki.com/feedlogo.gif http://pbwiki.com/ PBwiki 1.3.8 support@pbwiki.com email.hidden@example.com (jbfriesen) jbfriesen renamed Fall 2007 Course Schedule Fall Course Schedules ]]> Tue, 19 Aug 2008 10:44:21 +0000 mv http://ochemonline.pbwiki.com/Organic+Chemistry+Laboratory+Schedules+and+Syllabi email.hidden@example.com (jbfriesen) jbfriesen edited Organic Chemistry Laboratory Schedules and Syllabi]]> Tue, 19 Aug 2008 10:42:20 +0000 mod http://ochemonline.pbwiki.com/Organic+Chemistry+Laboratory+Schedules+and+Syllabi email.hidden@example.com (jbfriesen) jbfriesen edited Organic Chemistry Laboratory Schedules and Syllabi Fall 2007 2008 Course Schedules
Spring 2008 Course Schedules
]]> Tue, 19 Aug 2008 10:40:57 +0000 mod http://ochemonline.pbwiki.com/Fall+2007+Course+Schedule email.hidden@example.com (jbfriesen) jbfriesen edited Fall 2007 Course Schedule Please share your Sophomore Organic Chemistry Fall 2008 laboratory schedules.
Laboratory Schedule - Calendar- Dominican Univerisity University
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]]> Tue, 19 Aug 2008 07:27:05 +0000 mod http://ochemonline.pbwiki.com/Fall+2007+Course+Schedule email.hidden@example.com (jbfriesen) jbfriesen edited Fall 2007 Course Schedule Please share your Sophomore Organic Chemistry Fall 2008 laboratory schedules.
Fall 2008 Laboratory Schedule - Dominican Univerisity
download your document as a pdf or doc file - invite key = ochemrules
]]> Tue, 19 Aug 2008 07:24:18 +0000 mod http://ochemonline.pbwiki.com/Fall+2007+Course+Schedule email.hidden@example.com (jbfriesen) jbfriesen edited Fall 2007 Course Schedule This page is dedicated to Fall 2007 laboratory schedules.
Please Post yourSophomore Organic Chemistry Labschedule forFall 2007:
Laboratory Schedule Fall 2007- Dominican University
Please attach your Fall Laboratory Schedule and let us know what you did. invite key = ochemrules
]]> Tue, 19 Aug 2008 07:21:22 +0000 mod http://ochemonline.pbwiki.com/Discussion+Forum email.hidden@example.com (jbfriesen) jbfriesen edited Discussion Forum I would suggest D, but it would be only for students who have taken the at Least Gen Chem I and II, Organic I and II, and P Chem I and II. This is because before you are able to understand the technology, one must first understand the theory behind the technology. What good does it do to use a machine if you do not understand the output from your input? By the time you finishthese 6 semesters of chemistry, you have the sufficient knowledge to understand how IR, 13C and1H NMR, UV-VIS, GC, and evenhow MS work. From knowing these techniques, you have the knowledge to discern the data given by the machines. Using the machine should be a privilege since they are very expensive pieces of equipment.
This page is dedicated to discussion of issues relevant to
Sophomore Organic Chemistry Lab.
d) Allow student to run the analysis by themselves with minimal supervision during lab time.
e) Allow student to run the analysis by themselves withno supervision at various times outside of lab.
I w]]> Sat, 17 May 2008 11:12:26 +0000 mod http://ochemonline.pbwiki.com/2008+Student+Comments%3A+The+Ugi+Synthesis+Collaborative+Project email.hidden@example.com (jbfriesen) jbfriesen edited 2008 Student Comments: The Ugi Synthesis Collaborative Project -Ricardo Rodriguez
Make sure that you go back to filter your reaction early. Evaporation might not have been the best way to go. It left thick solid on the bottom that was hard to dissolve and deal with. Filtering might have made the next lab period a bit less frustrating (so get back to lab to check your solution EARLY for precipitate!!!)--K.S.
This experiment takes many days to see results. Be sure not to rush through the procedure, it may affect results. Do not be alarmed if you do not get a precipitate to form crystals. You may need to put the reaction mixture under pressurized air for a couple of days to see results. Alicia P.
]]> Fri, 02 May 2008 10:04:36 +0000 mod http://ochemonline.pbwiki.com/Student+Comments+for+Azo+Dyes email.hidden@example.com (jbfriesen) jbfriesen edited Student Comments for Azo Dyes - Ricardo Rodriguez
Don't panic if at times your solution thickens as whenadding 2-napthol and letting the solution sit in an ice bath. Your experiment should still work and you heat the solution later anyway to dissolve any solids--K.S.
When you are finished making the dye, it may be a good idea to weigh out the amount needed to do the fiber strip section and then immediately clean out the beaker containing the rest of the dye. Otherwise, it is easy for the dye to get all over your lab materials. Cleaning up will not be fun. Alicia P.
]]> Fri, 02 May 2008 09:53:52 +0000 mod http://ochemonline.pbwiki.com/Student+Comments+2008%3A+Adipic+Acid+Synthesis email.hidden@example.com (jbfriesen) jbfriesen edited Student Comments 2008: Adipic Acid Synthesis The nylon 6,6 synthesis at the end of the experiment is by far the most entertaining. When gathering your nylon, I suggest spooling it around your wire while immersed in the liquid. That will ensure maximum yield of the nylon without breakage and mess.
-Laura Volpe
.
- - Ricardo Rodriguez
Just because it looks harmless doesn't mean that it is!!!! Wear gloves when "playing" with the Nylon. This is important throughout the lab but especially when dealing with hydrogen peroxide as well--K.S.
It is important not to rush and stop the reflux before one hour. The two layers should be thoroughly mixed in order to form a nice amount of percipitate. Alicia P
]]> Fri, 02 May 2008 09:49:47 +0000 mod http://ochemonline.pbwiki.com/Student+Comments+2008%3A+Eucalyptus+Oil email.hidden@example.com (jbfriesen) jbfriesen edited Student Comments 2008: Eucalyptus Oil Make sure the round bottom flask is secured with the clamp before refluxing, otherwise the flask can easily slip off into the hot water bath, then you will have to restart the experiment. Alica P
Student Comments 2008: Eucalyptus Oil --invite key = ochemrules
Getting your product to recrystallize here can be quite difficult, simply scratching probably isn't enough. The procedure reccomended dipping the glass rod in the mixture, letting it dry, and then scratching. The best way to do it is to dip it in, let it dry, and then keep dipping it in and letting it dry until you see a solid start to form on the rod. Then start scratching and crystals should appear. Be patient. --Sarah Perz
-Ricardo Rodriguez
While it said this in the lab write up, I still feel that it is important to mention again....If you are going to use air to attempt to speed up recrystallization, DO NOT turn the air up too high. You not only lose your product but it is a pain to clean (you know, not that I did that....coug]]> Fri, 02 May 2008 09:47:29 +0000 mod http://ochemonline.pbwiki.com/Student+Comments+2008%3A+Adipic+Acid+Synthesis email.hidden@example.com (Kristina) Kristina edited Student Comments 2008: Adipic Acid Synthesis When measuring out the 30% hydrogen peroxide, do so by volume, not by weight, you need to deliver out a certain amount of hydrogen peroxide, and since it is not pure 100% Hydrogen peroxide, you will not deliver enough H2O2 if done by weight. The volume designated to be added takes into account that the H2O2 is 30% .
- Ricardo Rodriguez
Just because it looks harmless doesn't mean that it is!!!! Wear gloves when "playing" with the Nylon. This is important throughout the lab but especially when dealing with hydrogen peroxide as well--K.S.
]]> Fri, 02 May 2008 07:13:16 +0000 mod http://ochemonline.pbwiki.com/2008+Student+Comments%3A+The+Ugi+Synthesis+Collaborative+Project email.hidden@example.com (Kristina) Kristina edited 2008 Student Comments: The Ugi Synthesis Collaborative Project Using the 3,4-dimethoxybenzaldehyde and 2,4,6-trihydroxybenzoic acid combination, I was able to allow everything to dry out by unscrewing the vial open. After all the evaporation, I saw that there was a heterogeneous solid present. To help separate the solid mixture, I added a minimum amount of methanol to dissolve the solid. At first it would not dissolve, so instead of adding more methanol solvent, I chose to heat the mixture first, since solubility increases as temperature increases. Once everything dissolved after heating, I allowed the liquid mixture to cool to room temperature, and then proceeded to cool in an ice bath. This recrystallization gave me white crystals and a brown/red solution. I proceeded to separate using buchner filtration. So for these two reactants, methanol with heating and cooling will help separate the UGI product and biproducts.
-Ricardo Rodriguez
Make sure that you go back to filter your reaction early. Evaporation might not have been the best way to go. It left thick s]]> Fri, 02 May 2008 07:09:40 +0000 mod http://ochemonline.pbwiki.com/Student+Comments+2008%3A+Vanillin+Synthesis+from+4-Hydroxybenzaldehyde email.hidden@example.com (Kristina) Kristina edited Student Comments 2008: Vanillin Synthesis from 4-Hydroxybenzaldehyde 4-hydroxybenzaldehyde combine, the concentration of the intermediate increases to a maximum and then begins to fall as the reaction proceeds to completion or equillibrium. Through some previous experimental design, the value of time t in seconds where the intermediate reaches maximum concentration is determined to be 30 seconds. This intermediate is essential for the synthesis of vanillin, so it would be ideal to have the most intermediate present to continue the reaction. So it is important to quench the reaction with sodium bisulfate at 30 seconds. This is why 30 seconds is important. ( PChem Rocks)
-Ricardo Rodriguez
Ricky is completely right (though not about P chem "rocking" ;) ) timing is completely important. That is why you have to make sure that you do not add the 4-hydrobenzaldehyde directly to the flask when measuring but rather weigh it in the plastic weighing boats and take it back to your lab hood to add it. Adding it directly messes with the timing and you are gonna have to]]> Fri, 02 May 2008 07:05:09 +0000 mod http://ochemonline.pbwiki.com/Student+Comments+for+Azo+Dyes email.hidden@example.com (Kristina) Kristina edited Student Comments for Azo Dyes aminobenzenesulfonic acid joins could affect the physical properties of your azo dye product. For my particular reaction which involved Metanilic Acid and 1-naphthol, there were two possible locations on the 1-naphthol where the Metanilic acid could join. For my product, from the major director it came out to be a sludgey type of dark brown goo, which seemed more of a polymer. The minor product which is not benzene directing, the outcome could have been a more refined crytalline structure.
- Ricardo Rodriguez
Don't panic if at times your solution thickens as whenadding 2-napthol and letting the solution sit in an ice bath. Your experiment should still work and you heat the solution later anyway to dissolve any solids--K.S.
]]> Fri, 02 May 2008 06:59:00 +0000 mod http://ochemonline.pbwiki.com/Student+Comments+2008%3A+Eucalyptus+Oil email.hidden@example.com (Kristina) Kristina edited Student Comments 2008: Eucalyptus Oil When recrystallizing, it is important to use a MINIMUM amount of solvent. If you use too much solvent, you risk running the possibility that what ends up recrystallizing is the solvent itselft.
-Ricardo Rodriguez
While it said this in the lab write up, I still feel that it is important to mention again....If you are going to use air to attempt to speed up recrystallization, DO NOT turn the air up too high. You not only lose your product but it is a pain to clean (you know, not that I did that....cough, cough)--K.S.
]]> Fri, 02 May 2008 06:51:04 +0000 mod http://ochemonline.pbwiki.com/Student+Comments+2008%3A+Oxidation+of+Cinnamyl+Alcohol+using+Pyridinium+Chlorochromate email.hidden@example.com (Kristina) Kristina edited Student Comments 2008: Oxidation of Cinnamyl Alcohol using Pyridinium Chlorochromate If the solvent used in the TLC strips is not causing any movement of the samples, double check that you used the right solvent, for this experiment there are many chemicals used and lots of bottles, so READ the labels. Dont mix concentrated acid with explosives, lol.
- Ricardo Rodriguez
When putting together the dry-packed chromatographic column, make sure that you add enough sand to make a layer, but not enough to make a beach!!! Too much sand impedes the draining and sacrifices product--K.S.
]]> Fri, 02 May 2008 06:44:31 +0000 mod http://ochemonline.pbwiki.com/Student+Comments+2008%3A+Steam+Distillation+of+Essential+Oils email.hidden@example.com (Kristina) Kristina edited Student Comments 2008: Steam Distillation of Essential Oils -Laura Volpe
The active ingridient in cloves essential oil is Euganol, but Euganol is a very small percent of the essential oil composition. So take care not to lose any product, because when it comes time to analyze the GC, Euganol will be represented by a very small peak. Take very close notice to the times of the Standard GCs and the experimental GCs. By the way, this lab is tweaked with excess Euganol to help those who are helpless lol.
Remember, when you gravity filteryour product to place the magnesium sulfate dryign agent in the filter too. Just because it might stick to the bottom of the flask does not mean that there is no product left in it.....by not filtering it you might jeopardize thepercentyieldyou obtain--KS
]]> Fri, 02 May 2008 06:40:15 +0000 mod http://ochemonline.pbwiki.com/Discussion+Forum email.hidden@example.com (Ricardo Rodriguez) Ricardo Rodriguez edited Discussion Forum I would suggest D, but it would be only for students who have taken the at Least Gen Chem I and II, Organic I and II, and P Chem I and II. This is because before you are able to understand the technology, one must first understand the theory behind the technology. What good does it do to use a machine if you do not understand the output from your input? By the time you finishthese 6 semesters of chemistry, you have the sufficient knowledge to understand how IR, 13C and1H NMR, UV-VIS, GC, and evenhow MS work. From knowing these techniques, you have the knowledge to discern the data given by the machines. Using the machine should be a privilege since they are very expensive pieces of equipment.
This page is dedicated to discussion of issues relevant to
Sophomore Organic Chemistry Lab.
Topic #2: Learning About the Instruments --Melanie B.
Extending from the first question, how do people feel about learning more about the instruments? We learn about how to interpret the data, such as UV-vis]]> Wed, 30 Apr 2008 21:19:03 +0000 mod http://ochemonline.pbwiki.com/Caffeine email.hidden@example.com (Ricardo Rodriguez) Ricardo Rodriguez edited Caffeine Its rather wasteful of dichloromethane.
I use DCM instead of ethyl acetate because its easier to keep the aqueous layer in the separatory funnel.
I do not recommend using milk based products, reason why is that upon adding the base, the milk will curd. The solid curd will need to be filtered out. and the problem is that there is alot of solid, so removing it will take time since the Buchner filter will clog up after so much solid has been collected. I believe it took me three Buchner filtrations to completely separate the liquid from the solid.
-Ricardo Rodriguez
]]> Wed, 30 Apr 2008 21:03:45 +0000 mod