Define metal ion indicator with suitable example?
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Question: Define metal ion indicator with suitable example?
A metal ion indicator is a type of organic compound that changes its color when it binds to a specific metal ion. It is often used in complexometric titration to detect the endpoint of the reaction between a metal ion and a ligand, such as EDTA. A metal ion indicator forms a complex with a metal ion according to the equation:
M 2+ + HIn 2− → Min − + H +
where M 2+ is the metal ion, HIn 2− is the indicator, and Min − is the metal-indicator complex. The color of the indicator depends on the pH and the stability of the complex. For example, erichrome black T is a metal ion indicator that forms a red complex with Mg 2+ at pH 10, but turns blue when all the Mg 2+ is titrated by EDTA.
A suitable example of a metal ion indicator is xylenol orange, which is used to titrate Pb 2+ with EDTA at pH 6. Xylenol orange has a yellow color in its free form, but turns red when it forms a complex with Pb 2+. The endpoint of the titration is marked by the color change from red to yellow.
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