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Indicators change the colours when the PH of the sample changes. So during titration when the reaction is complete a new product will form which is resulting in sudden change of PH. This can be detected by the change in the colour of the sample. The reaction may be neutralization reaction or Redox reaction. So to know the exact stoichiometric quantity of reagents to complete a reaction we must use Indicators. different indicators give different colours based on the PH.

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Q: What are the importance of indicators in volumetric analysis?
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