Question

40. i) What is an acid base indicators?
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Answer 1

Answer:

Acid–base indicators are generally weak protolytes that change color in solution according to the pH. The acid–base equilibrium of a weak acid type of indicator (HI) in water can be represented as. [I] The acid, HI, and the conjugate base, I−, have different colors.

Explanation:

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Answer 2

Answer:

Acid - Base indicators (also known as pH indicators) are substances which change colour with pH. They are usually weak acids or bases, which when dissolved in water dissociate slightly and form ions. ... Phenolphthalein is a colourless, weak acid which dissociates in water forming pink anions.