Copper Sulfate | Chemical Properties and Copper Sulfate Use


Copper Sulfate Description 

Copper sulfate is a dark blue large granular crystal or blue granular crystalline powder at room temperature. It is poisonous, odorless, and has a metallic astringency. Concentrate and crystallize the solution of copper sulfate to obtain blue copper sulfate pentahydrate crystals, commonly known as gall alum.

Copper alum, or blue alum, has a relative density of 2.284. Bile vitriol is stable under normal temperature and pressure, does not dissipate, and will slowly weather in dry air. It loses two molecules of crystal water on heating to 45℃, loses four molecules of crystal water at 110℃, and loses all crystal water anhydrous at 150℃. 

Anhydrous matter is also easier to absorb water and convert into bile alum. This characteristic is often used to test whether certain liquid organic materials have a moisture content. Bile alum can be decomposed into black copper oxide, sulfur dioxide and oxygen when heated to a high temperature of 650°C.

The copper ions in copper sulfate can destroy the three-dimensional structure of the protein and denature it. When determining the protein concentration, alkali is often added to the protein, and then a solution of copper sulfate is added. At this time, the solution will turn purple. This reaction is called the Biuret reaction. Copper sulfate is one of the more important copper salts and is widely used in electroplating, printing and dyeing, dyes, pesticides, etc. 


Chemical Experiments 

If copper sulfate pentahydrate is heated, it loses its crystal water and its blue color because anhydrous copper sulfate is gray. The process can be reversed by adding water.

Elemental iron reacts with copper sulphate to form iron sulphate. Copper ions are replaced by iron ions. For example, when an iron nail is dipped in a solution of copper sulphate, a layer of copper is coated. At the same time, the solution turns green due to the newly formed iron sulfate.


Chemical Properties 

Copper sulfate is a weak oxidizing agent. Reacts with most metals to form copper and metal sulfate.

Copper Sulfate, Copper Sulfate Use

It reacts with sodium hydroxide or potassium hydroxide to form copper(II) hydroxide. Copper sulfate reacts with ammonia to form a dark blue solution in which cotton fibers can be dissolved. 

Copper Sulfate, Copper Sulfate Use

At high temperatures it decomposes into copper (II) oxide and sulfur oxide. 

Copper Sulfate, Copper Sulfate Use

When this oxide burns, the flame turns blue-green, this fact makes it possible to determine the copper compounds in the mixture. 



Copper Sulfate Use 


  • The coloring properties of c sulfate are actively used in the production of mineral paints. 
  • By adding a solution of copper sulfate to the soil, it is possible to combat the deficiency of important elements for the plant – Cu and S, and promote soil disinfection. 
  • When preparing solutions to obtain acetate fibers. 
  • C Sulfate is used to clean copper surfaces. 
  • In organic chemistry, it is used as a catalyst and oxidizing agent in many chemical reactions. 
  • C sulfate treatment against algae is also carried out (water stops blooming). 
  • As a preservative and color fixer in the food industry (food additive E519). 
  • In medicine, it is used to determine blood anemia and to detect sugar. 
  • C sulfate can be used to combat a very unpleasant consequence of flooding – rust spots on the roof.


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