Question

Write short on Adsorption indicators.​

Answer 1

Answer:

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Answer 2

Answer:

Adsorption Indicators : The adsorption is used to detect the end point of percipitation titrations. Dyes such as cosin, fluorescein are used as indicators. For example, A solution of sodium chloride containing a small amount of fluorescein is titrated against silver nitrate solution.

NaCl + AgNO3 → AgCl + NaNO3

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When chloride ions are over, fluorescein is adsorbed on white silver chloride precipitate, red colour is developed. Thus colour change from pale yellow to reddish pink can be observed at the end point.