Good question. When you do a reaction you always want to have a known sample that will be a positive control, and often a negative control along with your unknown sample. This way you know what a positive reaction looks like and you can determine if your unknown reaciton worked.
In the science field, a control is used in comparison to other test subjects or groups to see what kind of reaction you get for the test you are conducting. The actual definition is: “A control in an experiment is a group, sample, test, etc. that is used in comparison to the group, sample, test, etc. that the experiment is actually done for.Controls can also be samples in which the expected value is known. This is the part of the expirement that does not change.”
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