Name: Rik H.
What governs double decomposition reactions? For
example, if one was to put ammonium sulphate and sodium nitrate in
solution, would a reaction occur? Would the sodium sulphate be
soluble? Is there a way of separating the Na2SO4 from the mixture?
The classification scheme of "double decomposition" and its cousins has
pretty much been abandoned. There are too many exceptions, and
qualifications. The "reaction" you cite is a good example. The two salts
would just dissolve and the ions would just be there. There would not be any
reaction in the classical sense.
Both of the compounds you mention are very water soluble, and I think it
would be difficult to exchange the cation and anion.
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Update: June 2012