Question

explain three indicators​

Answer 1

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Indicators are substances whose solutions change color due to changes in pH. These are called acid-base indicators. ... We define pKai = - log(Kai), and the pKai value is also the pH value at which the color of the indicator is most sensitive to pH changes.

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Answer 2

Explanation:

• Natural indicators --- indicators which are obtained from nature
• Synthetic indicators --- indicators which are manufactured in laboratories
• Oilfactory indicators --- indicators which changes smell