The Sn1 Reaction Mechanism: Hydrolysis of T-Butyl Chloride
A solution of t-butyl chloride in acetone is added to water in the presence of a base and universal indicator. Depending on the concentration of t-butyl chloride, the reaction to form t-butyl alcohol is indicated by a series of drastic color changes.
The color change occurs as aqueous chlorine removes a proton from the transition state, resulting in a lower pH of the system (see mechanism in “concept” section). This demonstration can also qualitatively show that the rate of reaction is dependant of the concentration of t-butyl chloride.