It does not seem that sodium sulfate and potassium sulfide react with forming a precipitate because both sodium and potassium are alkali metals and their salts are soluble. It is possible to write the reaction as
Na2SO4 (aq) + K2S (aq) <==> K2SO4 (aq) + Na2S (aq) where the sign <==> shows that it goes in both ways until there will be equilibrium.
Apr 17th, 2015
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