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chlorek magnezu MgCl2 , Mg2+ 2Cl-
siarczan (VI) cynku ZnSO4, Zn2+,
fosforan (V) sodu Na3PO4, 3Na+,
siarczan (IV) potasu K2SO3, 2K+,
chlorek amonu NH4Cl, NH4+, Cl-
chlorek żelaza (II) FeCl2, Fe2+, 2Cl-
azotan (V) miedzi (II) Cu(NO3)2, Cu2+,