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acid-base indicator

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n.

A substance that indicates the degree of acidity or basicity of a solution through characteristic color changes.

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“Was” is used for the indicative past tense of “to be,” and “were” is only used for the subjunctive past tense.

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The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.

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Scientific definitions for acid-base indicator

acid-base indicator

A substance, such as litmus paper, that indicates the degree of acidity or basicity of a solution through characteristic color changes.
The American Heritage® Science Dictionary Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
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