Aluminium chlorohydrate is a group of water - soluble, specific aluminum salts having the general formula [Al₂(OH)ₙCl₆₋ₙ]ₘ, where n is between 1 and 5 and the m denotes the degree of polymerization. As a reliable supplier of aluminium chlorohydrate, understanding its molar mass is crucial not only for scientific research but also for practical applications in various industries.
Understanding the Chemical Structure
To calculate the molar mass of aluminium chlorohydrate, we first need to understand its chemical structure. The most common form is often described as a poly - hydroxy complex. Let's take a simplified form for the sake of calculation. For example, if we consider a basic unit of [Al₂(OH)₅Cl], we can break it down to calculate the molar mass.
The molar mass of an element is defined as the mass of one mole of that element, expressed in grams per mole (g/mol). The atomic masses of the elements involved are as follows:
- Aluminium (Al): The atomic mass of aluminium is approximately 26.98 g/mol.
- Oxygen (O): The atomic mass of oxygen is about 16.00 g/mol.
- Hydrogen (H): The atomic mass of hydrogen is around 1.01 g/mol.
- Chlorine (Cl): The atomic mass of chlorine is approximately 35.45 g/mol.
In the formula [Al₂(OH)₅Cl], we have:
- For aluminium: 2 atoms of Al, so the total mass contributed by aluminium is 2 × 26.98 g/mol = 53.96 g/mol.
- For oxygen: 5 atoms of O, so the mass contributed by oxygen is 5 × 16.00 g/mol = 80.00 g/mol.
- For hydrogen: 5 atoms of H, so the mass contributed by hydrogen is 5 × 1.01 g/mol = 5.05 g/mol.
- For chlorine: 1 atom of Cl, so the mass contributed by chlorine is 1 × 35.45 g/mol = 35.45 g/mol.
The molar mass of [Al₂(OH)₅Cl] is the sum of the masses of all the atoms in the formula, which is 53.96 + 80.00+ 5.05 + 35.45 = 174.46 g/mol.
However, it should be noted that aluminium chlorohydrate exists as a polymer with the general formula [Al₂(OH)ₙCl₆₋ₙ]ₘ. The value of n and m can vary, which means the molar mass can also vary significantly. When m is large, the molar mass of the polymer can be quite high.
Factors Affecting the Molar Mass
The molar mass of aluminium chlorohydrate is affected by several factors:
- Degree of Hydroxylation (n value): As the value of n in the formula [Al₂(OH)ₙCl₆₋ₙ]ₘ increases, the proportion of hydroxide groups (OH⁻) in the compound increases. Since the molar mass of the hydroxide group (OH) is 17.01 g/mol and that of the chloride ion (Cl⁻) is 35.45 g/mol, an increase in n generally leads to a decrease in the molar mass of the basic unit [Al₂(OH)ₙCl₆₋ₙ].
- Degree of Polymerization (m value): The value of m represents the number of [Al₂(OH)ₙCl₆₋ₙ] units linked together in the polymer. A higher m value means more units are combined, resulting in a higher molar mass of the overall polymer.
Significance of Molar Mass in Applications
The molar mass of aluminium chlorohydrate plays a vital role in its various applications:
- Water Treatment: In water treatment processes, aluminium chlorohydrate is used as a coagulant. The molar mass affects its coagulation efficiency. A higher molar mass polymer may have a greater ability to form larger flocs, which can settle more easily and remove suspended particles from water more effectively. For related water - treatment chemicals, you can also check out Polyacrylamide Emulsion and Polyacrylamide Powder.
- Cosmetics: In cosmetics, especially antiperspirants, aluminium chlorohydrate is used to block sweat glands. The molar mass can influence its solubility and reactivity on the skin. A compound with an appropriate molar mass can ensure effective performance without causing excessive irritation.
Analytical Methods for Determining Molar Mass
There are several analytical methods to determine the molar mass of aluminium chlorohydrate:
- Gel Permeation Chromatography (GPC): GPC is a commonly used method for determining the molar mass of polymers. It separates the polymer molecules based on their size in solution. By comparing the elution time of the sample with that of standards of known molar mass, the molar mass of aluminium chlorohydrate can be estimated.
- Light Scattering: Light scattering techniques, such as static light scattering and dynamic light scattering, can also be used to measure the molar mass of polymers. These methods rely on the interaction of light with the polymer molecules in solution to obtain information about their size and molar mass.
Our Offer as a Supplier
As a leading supplier of aluminium chlorohydrate, we understand the importance of molar mass in different applications. We ensure that our products are of high quality and have a consistent molar mass within the specified range. Our team of experts conducts rigorous quality control using advanced analytical methods to guarantee the reliability of our products.
Whether you are in the water treatment industry, cosmetics industry, or any other field that requires aluminium chlorohydrate, we can provide you with the right product that meets your specific requirements. If you are interested in purchasing our aluminium chlorohydrate or have any questions regarding its molar mass and applications, please feel free to contact us for further discussion and negotiation.
References
- "Chemistry of Aluminium Chlorohydrate" - Journal of Inorganic Chemistry
- "Applications of Aluminium Chlorohydrate in Water Treatment" - Water Research Journal
- "Molar Mass Determination of Polymers" - Polymer Science Handbook