Aluminum chloride hexahydrate

Aluminum Chloride Hexahydrate

Aluminum chloride hexahydrate is a chemical compound with the formula AlCl₃·6H₂O. It is a hydrated form of aluminum chloride and is commonly used in various industrial and medical applications. This compound is known for its role in antiperspirants and as a catalyst in organic synthesis.

Chemical Properties

Aluminum chloride hexahydrate is a white crystalline solid that is highly soluble in water. It has a molar mass of 241.43 g/mol. The compound consists of aluminum cations (Al³⁺) and chloride anions (Cl⁻) along with water molecules. The hexahydrate form indicates that there are six water molecules associated with each formula unit of aluminum chloride.

Structure

In its crystalline form, aluminum chloride hexahydrate forms a layered structure where the aluminum ions are coordinated by six water molecules, forming an octahedral geometry. The chloride ions are located between these layers, balancing the charge of the aluminum cations.

Uses

Antiperspirant

Aluminum chloride hexahydrate is widely used in antiperspirants due to its ability to block sweat glands. It works by forming a gel-like plug in the sweat ducts, reducing perspiration. This property makes it a key ingredient in many over-the-counter and prescription antiperspirant products.

Catalyst in Organic Synthesis

In organic chemistry, aluminum chloride hexahydrate is used as a catalyst for various reactions, including the Friedel-Crafts alkylation and acylation reactions. Its ability to act as a Lewis acid makes it valuable in facilitating the formation of carbon-carbon bonds.

Other Applications

The compound is also used in the treatment of hyperhidrosis, a condition characterized by excessive sweating. In addition, it finds applications in the production of aluminum metal and in the purification of water.

Safety and Handling

Aluminum chloride hexahydrate should be handled with care, as it can cause irritation to the skin, eyes, and respiratory tract. It is important to use appropriate personal protective equipment, such as gloves and goggles, when handling this compound. In case of contact with skin or eyes, the affected area should be rinsed thoroughly with water.

Environmental Impact

The environmental impact of aluminum chloride hexahydrate is generally low when used in controlled industrial processes. However, improper disposal can lead to contamination of water sources, where it can affect aquatic life. It is important to follow proper disposal guidelines to minimize environmental risks.

Also see

• Aluminum chloride
• Antiperspirant
• Friedel-Crafts reaction
• Hyperhidrosis

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