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The indicator used in the EDTA method is ___________(a) Benzene(b) Phenopthalene(c) Ethylene diamine(d) Erichrome black TThe question was posed to me in an interview for internship.The origin of the question is Estimation of Hardness in portion Water of Applied Chemistry

Answer»

Correct ANSWER is (d) Erichrome black T

To explain: The indicator USED in the EDTA method is erichrome black T. The hardness causing ions like Ca^++ and MG^++ FORMS the unstable complexes with reacting the erichrome black T.



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