Ammonium sulfate and barium chloride, I came up with NH2SO4- + BaCL
(NH4)2SO4 (aq) + BaCl2 (aq) -> BaSO4 (s) + 2 NH4Cl (aq)
Barium sulfate forms a precipitate.
I see I started out with the wrong formula Ammonium which is NH4 and I had NHSO4.
That's right. Also, ammonium ion has the charge of +1 and sulfate ion has the charge of -2, so to balance the charges we need 2 NH4+ ions and one SO4^2- ion: (NH4)2 SO4
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