Acid Base

This is a procedure for a titration experiment suitable for use both at home and in supervised high school or first-year college laboratory settings. Other than an inexpensive pH meter, all materials should be easily available for students to purchase at local stores.

Elmer’s Disappearing Purple Glue is a standard school supply in most K-12 classrooms. Many students are familiar with its bright purple color that disappears as it dries on their school projects. 

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The major constituent of a KoolAid or a similar non-carbonated soft drink will probably be either citric acid, malic acid, or a mixture of the two acids. Either of these two weak fruit acids provides a pleasant taste and an acidity level that makes the drink palatable.

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In a previously published work¹, I described an activity. In part it goes:

A debate broke out among students about red velvet cake during a recent chemistry class. We were studying natural acid-base indicators, and a student claimed that cocoa powder was an acid-base indicator.

Recently, Anne Schmidt and I published an article together in the Journal of Chemical Education.¹ The article outlines a titration activity that students can carry out at home using only store-bought items. The objective of the activity is to determine the amount of Mg(OH)₂ in milk of magnesia.

Co-Authored by Dean J. Campbell,* Bozana Lojpur,* and Rebecca Liu* *Bradley University, Peoria, Illinois