The reactions of ClONO2 with the Cl-(D2O)(n less than or equal to 3) and NO2- ions were studied in a flow-tube apparatus at several temperatures in the range 170-298 K and at a helium buffer gas pressure of 0.28 Torr. Rate constants for these reactions were determined, establishing that all these ions react quite efficiently with ClONO2. The product ions observed in reaction sequences are reported, and reaction mechanisms are proposed to account for the findings. In the case of Cl- and NO2- the main product ion is NO3-, while the hydrates Cl-(D2O)(n less than or equal to 1-3) lead to production of the hydrated species, NO3-(D2O)(m less than or equal to n-1). The main features of the observed secondary reactions can be described in terms of adduct formation and ligand switching. Limits on the bond energy of (NO3ClNO3)-, 14.6 kcal/mol less than or equal to D(NO3--ClONO2) less than or equal to 26 kcal/mol, were determined. Finally, implications of these studies to atmospheric chemistry are discussed.