During the demonstration, before each metal was added to the water, a drop of an acid-base indicator, phenolphthalein, was added to the water to monitor the reaction State specifically what was produced during the reaction that accounts for the pH change.

Chemical Principles in the Laboratory
11th Edition
ISBN:9781305264434
Author:Emil Slowinski, Wayne C. Wolsey, Robert Rossi
Publisher:Emil Slowinski, Wayne C. Wolsey, Robert Rossi
Chapter25: Ph Measurements-buffers And Their Properties
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During the demonstration, before each metal was added to the water, a drop of an acid-base indicator, phenolphthalein, was added to the water to monitor the reaction

State specifically what was produced during the reaction that accounts for the pH change.

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