(NH4)2SO4 is an ionic compound that dissociates itself upon its addition to the solvent to form a solution. When it is in the solution it forms ions. The balanced dissociation for for (NH4)2SO4 is
(NH4)2SO4 ---> 2NH4^+ + SO4^-2
The dissociation of (NH4)2SO4 forms 2 moles of ammonium ions (NH4^+) and 1 mole of sulfate ion (SO4^2-). It is already balanced.
(NH4)2SO4 has an IUPAC name of Diazanium sulfate but its common name is ammonium sulfate. It has other names such as diammonium sulfate, sulfuric acid diammonium salt, mascagnite, actamaster and Dolamin.
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