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Aluminum chloride

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Aluminum chloride
Systematic name Aluminium Trichloride
Other names Aluminium(III) chloride
Molecular formula AlCl3
SMILES [AL+3].[CL-].[CL-].[CL-]
Molar Mass Molar mass::133.34 g/mol
Appearance White and sometimes yellow
CAS number CAS number::16603-84-2
Density and phase Density::1.3 g/ml ?
Solubility in water 43.9 g/100 ml (0°C)
Melting point Melting point::100°C (hexahydrate)
Boiling point Boiling point::120°C
Molecular shape Trigonal planar

Octahedral (solid)
Tetrahedral (liquid)

Crystal structure Monoclinic, mS16
MSDS Material safety data sheet
Main hazards External MSDS
NFPA 704

NFPA 704 svg.png

R/S statement R: ?
S: ?
Related compounds
Other anions

Aluminium fluoride
Aluminium bromide
Aluminium iodide

Other cations

Boron trichloride
Gallium trichloride
Indium (III) chloride
Magnesium chloride

Related Lewis Iron (III) chloride Boron trifluoride
Except where noted otherwise, data are given for
materials in their standard state (at 25 °C, 100 kPa)
Disclaimer and references

Aluminum chloride is a compound made up of one aluminum ion and three chloride ions. It has a white appearance, but sometimes it can appear yellow due to contamination. This compound has a lower melting and boiling point than would otherwise be expected because of its structural properties. A large majority of aluminum chloride is use to make aluminum metal. The structure of this compound depends on its state of matter. Its forms large sheets arranged in a tight cubic packing pattern. Aluminum chloride can be made by the addition of chlorine or hydrogen chloride with aluminum metal. The compound reacts with alkyl chlorides and acyl chlorides to form carbocations which then attack the pi electron ring on benzene. Aluminum chloride often behaves more like a covalent compound.[1]


Aluminum Chloride consists of many different properties, some of which haven’t been discovered. Currently there is data that is proven as fact and data that is only predicted. This compound appears as a yellow to grey solid, sometimes it also appears to be white. The melting point of this compound is still experimental, but is predicted to be around 190 degrees Celsius. Thus, the flash point of this is as well, experimental, and is predicted to be -10 degrees Celsius. The experimental Gravity and Solubility is 2.44 g/ml and is found to react violently with water with liberation of heat. It is soluble in hcl and ethanol. It is stable, although it reacts violently in water. This is because of the prolonged storage, which leads to pressure build up and vent container periodically. The precise toxicity level is still unknown, but it is know to be quit toxic. For safety reasons do not get aluminum chloride in your eyes or on your skin, because they will burn off if you do. Wear gloves and safety gear when handling this compound. [2]

Synthesis / Occurrences

Another example of the compounds molecular structure

The synthesis of Aluminum chloride is chemically depicted as AlCl3. This unique compound is manufactured through and exothermic reaction that needs a temperature of 650 to 700 degrees Celsius to successfully make. In the United States along over 21,000 tons of Aluminum Chloride is produced alone. And that still does not include the consumption of the compound by the domestic metallurgical industry. Aluminum Chloride occurs in three states; solid, liquid and gaseous. When the compound is in its solid state it has a sheet like structure to it. This structure is made of cubic layers packed closely together. Although when the structure is put into 180 degrees the crystals sublime and are now in a vapor state. The compound is now written as Al2Cl6 and has a trigonal planar molecular structure to it. The compound is in its liquid state when a pressure of 2.5 atm is applied to the crystals, while raising the heat to 190 degrees Celsius. This compound reacts very violently when emerged into water.[3]


Aluminum chloride is used to treat excess precipitation or sweating problems. The way it is thought to work is by alternating the sweat-producing cells in the body. It would be a bad idea to use this solution if you are allergic to any ingredient in aluminum chloride solution. Also make sure to ask a doctor before any of this applies to you. Some medical conditions may interact with this solution such as the following: If you are pregnant or are planning to become pregnant, if you are currently taking any prescription or nonprescription medicine, herbal preparation, or dietary supplement, and having any allergic reactions to any medicines, foods, or other substances. This is how you use Aluminum chloride solution. This solution should only be used at night because that is when the sweat glands are most active. And this allows up to 6 to 8 hours of inactive sweat. But you must not apply this to broken, irritated, or recently shaved skin. Make sure the area you are going to apply the solution to is completely dry. You can use a hair dryer to help quicken this process to ensure dryness. Apply solution only with cotton balls. Apply only to the underarms, on your hands or feet, and scalp. Do not be near a open flame when using this product.[4]


These two bottles are full of Aluminum chloride, ready to be used in the chemistry world.

Overdosing on Aluminum Chloride is very dangerous. The medicine is extremely harmful if you swallow it. It is only made to go on the outer part of the body. You must alert poison control right away if you overdose or swallow this medicine. Another warning you might want to know is that sharing this medication with others is very unwise. If you miss a dose of this, use it again as soon as you can. But do not double dose to catch up. When storing this item, it best at room temperature, away from any heat source. Keep this medication in a tightly closed container, and keep all of the medicine away from children and pets. Do not flush this product; throw it away in a garbage can. If you need help disposing this talk to your doctor right away. Remember to always use wisely.[5]


How to make Aluminum chloride.


  1. Morgan, Anthony.Facts about aluminum chloride. “socyberty”. Web. 1-4-14.
  2. Batchelor, Colin. Aluminium chloride. “ChemSpider”. Web. 1-4-14.
  3. The Synthesis of Aluminum Chloride. “”. Web. 1-4-14.
  4. Wolters, Kluwer. Aluminum chloride solution. “”. Web. 1-4-14.
  5. Paul, Greg. Drugs and Medications – aluminum chloride top. “WebMD”. Web. 1-4-14.