Anhydrous copper sulfate (chemical formula: CuSO4) is an inorganic compound and has a white or off-white powder appearance. Anhydrous copper sulfate is weakly acidic in aqueous solution and is blue. However, when crystallized from an aqueous solution, blue copper sulfate pentahydrate was formed.
Copper sulfate pentahydrate (chemical formula: CuSO4·5H2O) is also called copper sulfate crystal. In order to distinguish it from “anhydrous copper sulfate”, it is usually read as “copper sulfate pentahydrate”, commonly known as blue dragonfly, cholesteric or copper enamel. Copper sulfate pentahydrate is a widely distributed sulfate mineral. It is a secondary mineral formed by the decomposition of copper sulfide by oxygen.
Features:
Anhydrous copper sulfate easily absorbs moisture in the air and becomes a hydrate. After heating, the crystal water is lost, heated to 102 ° C to lose two crystal water; 113 ° C loses three crystal water; 258 ° C loses all crystal water; when the heating temperature reaches 653 ° C, begins to decompose to form CuO and SO3, at 720 ° C The decomposition ends.At 200 ° C, all of the crystal water was lost to form an anhydrate. It is also possible to lose five crystal waters under the action of concentrated sulfuric acid.
use:
Anhydrous copper sulfate is mixed with lime water in the agricultural field to form Bordeaux mixture. It is used as a fungicide to control fungi on crops and prevent fruits from decaying. It is used as a chelating agent and clarifying agent in food grade for the production of preserved eggs and wine. Used as an emetic in the medical field.
Copper sulfate pentahydrate is a chemical raw material for pigments, batteries, insecticides, wood anticorrosion, etc. Indications for phlegm and blood stasis, stagnation, dampness and insecticide. For wind-heat choking, epilepsy; topical treatment of mouth sores, wind eye red, sore swollen poison.