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What is an indicator?

A. An organic compound that changes color in acids and bases
B. A strong acid
C. The amount of ions in solution
D. The concentration of acids or bases

User Vitakot
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1 Answer

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The answer is A because An Indicator" changes color when it comes in contact with an acid or a base

An indicator could be anything like:
1) Litmus paper
2) Bromothymol blue
3) Phenolphthalein
User Bruce Smith
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