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        Ca(HCO₃)₂+2NaR——CaR₂+2NaHCO₃
        Mg(HCO₃)₂+2NaR——MgR₂+2NaHCO₃

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        CaSO₄+2NaR——CaR₂+Na₂SO₄
        MgSO₄+2NaR——MR₂+Na₂SO₄

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        CaR₂+2Na⁺=2NaR+Ca²⁺
        MgR₂+2Na⁺=2NaR+Mg²⁺

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        Ca(HCO₃)₂+2HR----CaR+2H₂O+2CO₂
        Mg(HCO₃)₂+2HR----MgR+2H₂O+2CO₂

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        CaSO₄+2HR----CaR+H₂SO₄
        CaCl+2HR----CaR+2HCl
        MgSO₄+2HR----MgR+H₂SO₄
        MgCl₂+2HR----MgR+2HCl

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