The photophysical properties of the quinine dication are well documented in the scientific literature. In the educational literature this species has been used as a flourescent compound in an experiment designed to illustrate the principles of flourimetery to undergraduate students. This simple steady-state flourescence experiment for undergraduate students involves studying the quenching of quinine flourescence by Cl macr and Br macr in solutions of different ionic strength. The experiment enchances the student s understanding and experience in the technique of fluorimetry and illustrates how the Debye-H uuml ckel law can be used in conjunction with the Stern-Volmer equation to study how the ionic activity of a solution influences the rate of reaction