What Is The Formula For Copper Ii Sulfide?

How to Write the Formula for Copper (II) sulfide YouTube
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What is the Formula for Copper II Sulfide?

Copper II sulfide is a chemical compound that consists of copper and sulfur atoms. It is commonly used in various industries, including electronics, ceramics, and pigments. Understanding its formula is essential for scientists and researchers working with this compound.

The Chemical Formula

The formula for copper II sulfide is CuS. This formula indicates that one copper (Cu) atom is combined with one sulfur (S) atom to form a single unit of copper II sulfide. The Roman numeral II in the name indicates the oxidation state of copper in the compound, which is +2.

The Structure

Copper II sulfide has a crystal structure that belongs to the orthorhombic system. The atoms are arranged in a specific pattern, forming a lattice-like structure. This arrangement gives copper II sulfide its unique properties and characteristics.

The Properties

Copper II sulfide is a black solid with a high melting point. It is insoluble in water and does not conduct electricity. However, it can conduct electricity when it is in a molten state or when it is doped with impurities to create a semiconductor material.

The Formation

Copper II sulfide can be formed through various methods. One common method is the reaction between copper oxide (CuO) and hydrogen sulfide (H2S) gas. The chemical equation for this reaction is:

2CuO + H2S → CuS + H2O

In this reaction, copper oxide reacts with hydrogen sulfide to produce copper II sulfide and water as the byproduct.


Copper II sulfide has several applications in different industries. In the electronics industry, it is used as a semiconductor material in various electronic devices, including transistors and solar cells. In the ceramics industry, it is used to create pigments for glazes and pottery. It is also utilized in the production of catalysts and as a component in the manufacturing of lithium-ion batteries.

Safety Considerations

When working with copper II sulfide, it is important to take proper safety precautions. The compound should be handled in a well-ventilated area, and protective equipment, such as gloves and goggles, should be worn. Additionally, it should be stored in a tightly sealed container away from heat and moisture to prevent any potential hazards.


In conclusion, the formula for copper II sulfide is CuS. This compound plays a significant role in various industries due to its unique properties and applications. Understanding its structure, properties, and formation is crucial for scientists and researchers working with this compound. By following proper safety guidelines, it can be utilized effectively in different applications.