In this VIDEO, Mr. Hatfield demonstrates the use of 'universal indicator solution' , as a means of comparison with the pH indicator strips used in the "pH of Solutions Lab" performed in class between May 5-12.
Unlike the lab, where we simply estimate pH from color changes, in this demonstration Mr. Hatfield goes back and forth, first adding positive charge (an acid), then negative charge (a base).
This is essentially a series of neutralization reactions swinging back and forth around pH 7 (neutral), and similar in concept to the titrations that will be the subject of our next set of Lab Activities.
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