Spot tests are simple chemical
procedures which uniquely identify a substance. They can be done on small samples, even
microscopic samples of matter with no preliminary separation.
In a typical spot test, a chemical reagent is added to
a mixture. If the substance in question is present, it produces a chemical reaction
characterized by one or more unique observables.
| These observables can
include..... |
| gas bubbling, color
change, odor, precipitation. |
|
 |
| Occasionally the presence of one substance will
interfere with the identification of another. |
| This is referred to as an.....Interference. |
| Alternative tests must be used to get definitive
results. |
...
SUGGESTIONS |
| 1. In filling out your DATA SHEET, enter enough information so that you could reproduce the experiment without
using your Manual. |
2. Save your UNKNOWN
until you get a grade on this experiment. It does not matter if it
evaporates. The UNKNOWN itself is nonvolatile.
If there is a mistake in making up your UNKNOWN, it can
be corrected but only if it
exists and we can test it. |
|
