Question

Question #99100

Answer 1

Besides being an example of double replacement, this is a precipitation reaction, as calcium carbonate is not soluble in water, while the other compounds mentioned are.
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Explanation:

The balanced equation is this:

`(NH_4)_2CO_3 (aq)+CaSO_4 (aq) rarr (NH_4)_2SO_4 (aq)+ CaCO_3 (s) darr`

The net ionic equation is

`Ca^(2+) + CO_3^(2-) rarr CaCO_3 (s) darr`

The spectator ions are `NH_4^+` and `SO_4^(2-)`

This reaction occurs because the combination of calcium ion and carbonate ion results in a compound of low solubility in water (calcium carbonate).