Aluminium chloride in acidified aqueous solution forms an ion having geometry:

Question

Canvas Classes · Accepted Answer

Strategy:
 Look at the hydration behavior of the highly charged  ion in acidic solutions.

Step 1: Formation of the complex
When solid  is dissolved in acidified water, the small and highly charged  ion acts as a strong Lewis acid and gets heavily hydrated.

Step 2: Determine geometry
It coordinates with 6 water molecules to form the hexaaquaaluminium(III) ion, .
A coordination number of 6 corresponds to an octahedral geometry.

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