What are indicators? Give examples and their colour changes in different .
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indicators are substances which indicates that the substance on which it is tested are a acid or a base.
phenol red is a indicator.
its colour in acid is yellow.
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The indicator is a mixture of indicator dyes that gives a spectrum of colours depending on how acidic or alkaline a solution is. Universal indicators give different colours at different concentractors of hydrogen ions in a solution.
For example a universal indicators Purduces green colour in a neutral solution when pH is 7
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