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        SO₃+H₂O+Ca(OH)₂→CaSO₄↓+2H₂O
        SO₂+H₂O+Ca(OH)₂→CaSO₃↓+2H₂O
        2HF+Ca(OH)₂→CaF₂↓+2H₂O
        FeSO₄+Ca(OH)₂→Fe(OH)₂+CaSO₄↓
        Ca(OH)₂+2H₃AsO₃→Ca(AsO₂)₂↓+4H₂O(As��6mg/L)
        Ca(OH)₂+H₃AsO₃→2Ca(OH)AsO₂+2H₂O(As��6mg/L)
        3As₂O₃+2Fe(OH)₃→2Fe(AsO₂)₃↓+3H₂O(As₂O₃�ʹ̑B(t��i)�r(sh��))

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