write the colour responses in acidic and basic media with different indicators
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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. ... At low pH values the concentration of H3O+ is high and so the equilibrium position lies to the left.
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in the litmus paper test
acid turns blue litmus to red
base turns red litmus to blue
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