Aluminum ions treated with aqueous ammonia produce which observation?

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Multiple Choice

Aluminum ions treated with aqueous ammonia produce which observation?

Explanation:
When you add a weak base like aqueous ammonia to a solution containing aluminum ions, aluminum hydroxide forms. This hydroxide is a white, gelatinous solid. Aluminum hydroxide can dissolve in strong bases to form a soluble aluminate complex, but ammonia is not strong enough to push that dissolution under ordinary conditions. So you end up with a white precipitate that does not dissolve in excess ammonia. Aluminum compounds aren’t green, and there is indeed a precipitate, so the observations described fit the white, insoluble precipitate.

When you add a weak base like aqueous ammonia to a solution containing aluminum ions, aluminum hydroxide forms. This hydroxide is a white, gelatinous solid. Aluminum hydroxide can dissolve in strong bases to form a soluble aluminate complex, but ammonia is not strong enough to push that dissolution under ordinary conditions. So you end up with a white precipitate that does not dissolve in excess ammonia. Aluminum compounds aren’t green, and there is indeed a precipitate, so the observations described fit the white, insoluble precipitate.

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