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What is Present in the Liquid Phase?Ions:Ca ++ , Na + , Mg ++ , SO 4= , Cl - , etc.Ion Pairs:CaCO 3 , CaHCO 3+ , MgHSO 3- , MgSO 3 , CaSO 4 , etc.All liquid phase reactions are at equilibrium:Ca ++ + CO=3 CaCO 3Ca ++ + HCO-3 CaHCO+3