Inorganic Chemicals

Several chemical tests utilize copper sulfate. It is used in Fehling& acute;s solution and Benedict& acute;s solution to test for reducing sugars, which reduce the soluble blue copper(II) sulfate to insoluble red copper(I) oxide. Copper(II) sulfate is also used in the Biuret reagent to test for proteins.
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Copper sulfate is also used to test blood for anemia. The blood is tested by dropping it into a solution of copper sulfate of known specific gravity – blood which contains sufficient hemoglobin sinks rapidly due to its density, whereas blood which does not floats or sinks less rapidly.

In a flame test, its copper ions emit a deep green light, a much deeper green than the flame test for barium.

In the presence of chlorine, copper ions emit a deep blue light.