Question #99100

1 Answer
Jan 14, 2017

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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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).