define universal indicators
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a mixture of dyes that changes colour gradually over a range of pH and is used (especially as indicator paper) in testing for acids and alkalis.
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⭕ Universal indicators are those mixture of dyes which give different colors on dipping in acid or base.
⭕ they are of two types natural and Synthetic indicators.
⭕ methyl orange and phenolphthalein are natural indicators. blue and red Litmus are Synthetic indicators.
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