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2. Chlorek sodu NaCl -----> Na ⁺ + Cl ⁻
3. Siarczan ( VI) źelaza Fe So₄ -----> Fe ²⁺ + (SO₄)₂ ²⁻
4. Węglan wapnia CaCo₃ ------> 2Ca ²⁺ + (CO₃)₂ ²⁻