...Analytical chemistry is the study of the chemical composition of natural and artificial materials. Properties studied in analytical chemistry include geometric features such as molecular morphologies and distributions of species, as well as features such as composition and species identity. Unlike the sub disciplines inorganic chemistry and organic chemistry, analytical chemistry (like physical chemistry) is not restricted to any particular type of chemical compound or reaction.The contributions made by analytical chemists have played critical roles in the sciences ranging from the development of concepts and theories (pure science) to a variety of practical applications, such as biomedical applications, environmental monitoring, quality control of industrial manufacturing and forensic science (applied science). Read full entry
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- 1.Analytical Chemistry
- http://pubs.acs.org/journals/a
ncham/index.html
- 2.Analytical chemistry - Wikipedia, the free encyclopedia
- For the journal, see Analytical Chemistry (journal) ... Properties studied in analytical chemistry include geometric features such as ...
- http://en.wikipedia.org/wiki/A
nalytical_chemistry
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Analytical Chemistry?
What is Analytical Chemistry
and if you major in it what
could you do? Same with
Organic Chemistry.
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Analytical Chemistry has to do with analyzing substances, whether qualitatively or quantitatively. This branch of chemistry involves trying to determine what specific elements, compounds, or group of chemicals comprise a given substance in question, whether it be organic or inorganic in nature. Sometimes it can be as simple as just proving the presence or absence of a specific chemical. Then, once the elements or compounds are found, then you have to quantify them by calculating the percentage composition, or the actual amount in grams, etc. With this major, you can work as an analytical chemist in any manufacturing, food or cosmetic, oil or chemical, companies or even in a musuem. Lots of options and opportunities of employment. Being an analytical chemist, however, requires a lot of knowledge in the operation, and general maintenance of a lot of high tech instruments like HPLC, GC-MS, UV-Vis, IR and NMR spectrometers, etc. Organic Chemistry is more limited in scope in a sense that you are only dealing with organic compounds. However, there are a lot more organic chemicals than inorganic. I personally believe it is more challenging. In any case, to be an organic chemist does not just require being an analytical chemist, but also as a research or synthesis chemist. This means that you come up with describing and elucidating reaction mechanisms and extensive characterizing the synthesis of new chemicals. Obviously, an organic chemist, for the most part will not be employed in a steel or metal manufacturing company but the opportunities for employment are numerous as well, including research institutions and government agencies. |
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I need an analytical chemistry I need an analytical chemistry
lab idea in which one
determines the caffeine
content of coffee, preferably
using a spectrophotometer.
This is for an AP Chemistry
class.
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The first answer is a good setup. if you want to use spectroscopy to do the final determination, you can simply use UV-visible spectrometry to measure the concentration. Caffeine will absorb in the UV region. You can look at it's UV spectra in this report http://journals.tubitak.gov.tr /chem/issues/kim-02-26-2/kim-2 6-2-20-0006-10.pdf (it's a pdf). to perform the measurement, you will simply dissolve the collected caffeine in a specific volume of water, and determine its concentration based on the intensity of it's UV spectra at a specific wavelength. You will of course have to first develop a calibration by disolving controlled amounts of caffeine into water and measuring the response of those calibration standars against the instrumental response. From the spectra in the pdf, it looks like you would want to use either ~210 or 275 as the wavelength for the measurement. Basically, to calibrate, you will plot absorbance on the y axis, and prepared concentration on the x axis. According to Beer's law, this will be a straight line (i.e., y=mx + b). The exquation of that line can then be used to determine the amount of cafeine in the unknown. you will simply put the measured instrument response at the wavelength you chose into the equation as "y", and solve for x. x will be your unknown concentration in the volume of water you prepared. Multiply by that volume, then divide by the initial gram weight of instant coffee that you used to get the concentration (gram caffeine per gram instant coffee) of caffeine in the instant coffee. |
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What do you think of Organic I have to take Organic I and
II in the fall. I am dreading
it. What do you think of the
different areas of Chemistry
that I listed? What do you
think of Biochemistry? In
addition to taking Organic I
and II, Physical I and II and
Analytical, I have to take
"Intrumental Analysis", which
shows how to use some cool
technology used in the field
of Chemistry.
Sorry yes, I will be taking
Organic Chem I in Fall 2009,
and Organic Chem II in Spring
2010. Sorry for the confusion.
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Just curious, why are you taking both Orgo I and II at the same time? You'd think that one would take them consecutively. In my opinion, organic chemistry is really not as hard as it's made out to be. Compared to my Thermodynamics class, it was a piece of cake! I had a really helpful cliffnotes type book that helped me alot. http://www.amazon.com/Organic- Chemistry-Second-Language-Tran slating/dp/0470129298/ref=pd_b bs_sr_1?ie=UTF8&s=books&qid=12 32128135&sr=8-1 Using that book, I never had to open my actual textbook! That's how helpful that book was for me. Physical Chemistry is a rather odd area and you don't really use it outside of the class. It's a lot of equations about quantum mechanics. Analytical Chemistry is, in my opinion, the most annoying class. At my college, the professor started taking off points if your lab results were .01% off the class average results! Material-wise, however, it is probably the simplest of the three. In the beginning we covered a bunch of statistical analysis and then moved on to stuff like acids and bases (which can be confusing). I'm guessing your Instrumental Analysis class is going to teach you how to use some of the chromotography machines and how to read nmr data. If that's the case, its not a bad class either depending on how complex the nmr data is. Using carbon and proton nmr is okay, but when they bring mass spec and uv-vis into the equation....ugh. Well, in any case, your classes could be completely different from mine, but that's my take on things. |
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