why must the flask be covered with watch glass or inverted beaker?

Chemistry for Engineering Students
3rd Edition
ISBN:9781285199023
Author:Lawrence S. Brown, Tom Holme
Publisher:Lawrence S. Brown, Tom Holme
Chapter11: Chemical Kinetics
Section: Chapter Questions
Problem 11.56PAE: The labels on most pharmaceuticals state that the medicine should be stored in a cool, dark place....
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From an experiment on acid-base titration, in the standardization of HCl (Part B), why must the flask be covered with watch glass or inverted beaker? (min. 5 sentences)

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