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Question

What is an indicator?


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Solution

Indicator

  • An indicator is a chemical compound that changes its colour in presence of an acid or base.
  • Indicators are generally derived from plant pigments and are mildly acidic or basic in nature.

Types of indicators

  • Natural indicators. For example red cabbage.
  • Synthetic indicators. For example phenolphthalein.
  • Olfactory indicators. For example onion.

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