Chemical indicator

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Chemical Indicator

A Chemical Indicator (pronunciation: /ˈkɛmɪkəl ˈɪndɪˌkeɪtər/) is a substance that undergoes a distinct observable change when conditions in its solution change. This could be a change in color or clarity, formation of a precipitate, or the evolution of gas.

Etymology

The term "Chemical Indicator" is derived from the Latin words 'Chemia' meaning 'Chemistry' and 'Indicare' meaning 'to indicate'.

Types of Chemical Indicators

Chemical indicators can be classified into several types based on their application:

  • Redox Indicators: These indicators undergo a color change at a specific electrode potential.

Usage

Chemical indicators are widely used in various fields such as:

  • Chemistry: They are used in titrations to indicate the completion of a reaction.
  • Biology: They are used to indicate the pH of a solution, or to identify certain substances.
  • Medicine: They are used in diagnostic tests.

Related Terms

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