Question

When aluminium nitrate is made to react with sodium metal, does the reaction occur?
Explain why. Also, identify the two categories in which this kind of reaction can be placed.

Answer 1

Answer:

Assuming we are in aqueous conditions, the aluminium ion is small and highly charged which withdraws electron density from the O - H bonds in the hydrated complex and makes them quite acidic:

[Al(H2O)6]3+⇌[Al(H2O)5OH]2++H+

Carbonate ions are basic and extract further protons.

It would eventually go down to aluminium hydroxide [Al(H2O)3(OH)3]

Since this is uncharged it drops out of solution as a precipitate.

This results in an acid - base reaction:

2H++CO2−3→CO2+H2O

You would therefore also see effervescence due to the formation of carbon dioxide.

For these reasons you would not see the formation of aluminium carbonate and this does not exist as a discrete compound.

Explanation:

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