© 2008-2012 The Regents of the University of California. All Rights Reserved. Science & Health Education Partnership. Using a potassium hydroxide solution (KOH) in one vial and water in the others, students simulate the exchange of body fluids to discover how infectious diseases spread. Using the acid-base indicator, phenolphthalein, students discover who has been infected and try to predict the number of infections that would occur after more interactions. Students identify behaviors that increase or decrease the risk of infection.
