The type of chemical analysis done in this experiment is qualitative, rather tha
ID: 1079087 • Letter: T
Question
The type of chemical analysis done in this experiment is qualitative, rather than the quantitative type you have become familiar with. In other words, your task in this experiment is to determine whether or not a particular ion is present, rather than measuring the exact amount in solution. You will be given an unknown mixture which will contain 3 or 4 of the following ions: In many of the tests for particular ions, there will be interference if certain other ions are also present. In this experiment, nearly all interference will be eliminated, i.e., your unknown will only contain ions which can be tested for in the presence of each other. However, it is important to carry out the tests in the order given. As you go through the experiment, try to identify the type of reaction taking place: precipitation, acid-base, complex-ion formation, or oxidation-reduction. You should be able to write (and remember!) the net-ionic equation for each of the tests performed. Above all, be constantly aware of what you are doing, and why. If you merely go through the motions like a robot, you won't learn, much less remember, any chemistry. Make the most of your laboratory experience EXPERIMENTAL PROCEDURE IMPORTANT: Wear your safety glasses while performing this experiment! The proper way to carry out a qualitative analysis experiment is to not only test your unknown sample for the presence of a particular ion, but at the same time to test a known solution (to see what a positive test looks like), and also a blank (usually water, to see what a negative test looks like). It is weak positive test looks like. If these tests are run simultaneously side-by-side, it hardly takes any longer than running the unknown. As you perform each test, record your observations on the "Data and Observations" form. usually a good idea to also run the test on a diluted known, so you can see what a Some general suggestions which apply to all seven of the tests: For each test, label 4 small test tubes "K", "D", "U", and "B" (for "known", "dilute known", "unknown", and "blank"). In order to prepare the diluted known: Place two drops of the known ion solution into the "D test tube. Then add 18 drops of deionized (DI) water and mix thoroughly by flicking the tube hard with your index finger, as shown by your instructor. This will produce a solution with one-tenth of the original concentration of the known, having a volume of 1 mL In some of the tests, a boiling-water bath will be required; set one up in a 150-mL beaker before you start.Explanation / Answer
The type of chemical analysis done in this experiment is qualitative, rather tha
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