Why octahedral structure is formed of aluminium chloride in acidified aqueous solution

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Please find the solution to the asked query:

Aluminium chloride in acidified aqueous solution, forms an octahedral complex.
Aqueous solution is mostly water and when the compound is dissolved in acidified aqueous solution,
the water fills its vacancies and an octahedral complex ,[Al(H2O)6]3+ is formed.
The trichlorides on hydrolysis form an anionic species [M(OH)4]- and aluminium chloride which forms a dimer will thus form
[Al(H2O)6]3+

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