It has been demonstrated that the reaction between gaseous chlorine nitrate and water on room temperature liquid surfuric acid (95.6%) surfaces yields hypochlorous acid in the gas phase. First-order loss rate constants for chlorine nitrate (equivalent to a value of the sticking coefficient &ggr;=3.2¿10-4) have been determined. This value is five orders-of-magnitude greater that reported values on similar areas of more inert surfaces. Application of results of this type to stratospheric models must await ongoing studies at lower temperatures. ¿ American Geophysical Union 1987