Q.41)
Acidic or Basic dyes are used as Indicator in
(1 marks)
Ans.
Fajan's Method
Mohr's method
Volhard's method
Gravimetric method
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acidic or basic dyes are used as indicator in mohar's method
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Answer:
Option A-Fajan's method is the right choice.
Explanation:
Fajan's method uses an adsorption indicator such as fluorescein (Dichlorofluorescein) and eosin. The indicator adsorbs onto the surface of the silver salt precipitate at the endpoint.
The adsorption process causes a change in the color of the indicator
Common Fajans adsorption indicators are weakly acidic organic compounds and in alkaline conditions will exist as the conjugate base, In- (or Ind'). It is this form of indicator which interacts with the precipitate.
Hence, Fajan's method uses both acidic and basic dyes.
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