define :acid -base indicators
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Acid
Acid are substances which turn blue litmus paper red. They are sour in taste.
Base
Base are substances which turn red litmus paper blue. They are bitter in taste.
Indicator
Special type of substances are used to test whether a substances are called Indicator.
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Acid- Base Indicators (also known as pH indicators) are substance which change colour with pH. they are usually weak acid or bases, which when dissolved in water dissociated slightly and form ions. consider an indicator which is a weak acid, with the formula hln.
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