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¢Ù 2NH4+ + Ba2++ 2OH- + SO42- = BaSO4¡ý+2NH3¡¤H2O

                                                                         

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¢Å¢Ù CaCO3 + 2H+ = Ca2++ CO2¡ü+H2O

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¢Ú Mg(OH)2 + 2CH3COOH =Mg2+ + 2CH3COO¡ª  +2H2O

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