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BaS ( siarczek baru)
CuSO₄ + BaS---> CuS (nierozpuszczalna) + BaSO₄ (nierozpuszczalna)
CuS (siarczek miedzi (II) )
BaSO₄ (siarczan (VI) baru)
3CdSO₄ + Hg₃(SiO₃)₂ --> Cd₃(SiO₃)₂ + 3HgSO₄