Ionic Reaction of Ammonium Sulfate with Calcium Acetate
There are two substances, ammonium sulfate ($ (NH_ {4}) _ {2} SO_ {4} $) and calcium acetate ($Ca (CH_ {3} COO) _ {2} $), which meet in solution and undergo ionic reaction.

Ammonium sulfate is completely ionized in solution, and its ionization equation is: $ (NH_ {4}) _ {2} SO_ {4} = 2NH_ {4} ^ {+} + SO_ {4} ^ {2 -} $. Calcium acetate is also completely ionized, and the ionization equation is: $Ca (CH_ {3} COO) _ {2} = Ca ^ {2 + } + 2CH_ {3} COO ^{-}$。

When the two solutions are mixed, calcium ions ($Ca ^ {2 +} $) combine with sulfate ions ($SO_ {4} ^ {2 -} $) to form calcium sulfate ($CaSO_ {4} $) precipitate, which is slightly soluble in water and exists as a precipitate in solution. The ionic reaction equation is: $Ca ^ {2 + } + SO_ {4} ^ {2 - } = CaSO_ {4}\ downarrow $. Ammonium ion ($NH_ {4 }^{+}$） does not react with acetate ion ($CH_ {3} COO ^ {-} $), and still exists in the solution in the form of ions.

Through this ionic reaction analysis, it can be seen that when ammonium sulfate is mixed with calcium acetate solution, the key reaction is that calcium ion combines with sulfate ion to form calcium sulfate precipitation, which is the core of the reaction.