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What is the indicator used in EDTA method?

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in Environmental Engineering by (81.4k points)
What is the indicator used in EDTA method?

(a) Potassium chromate

(b) Potassium dichromate

(c) Potassium chloride

(d) Erio chrome, black T

This question was addressed to me in an international level competition.

My query is from Chemical Characteristic of Water topic in portion Quality of Water of Environmental Engineering

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Correct answer is (d) Erio chrome, black T

The explanation: Hardness is determined by using Ethylene diamine tetra-acetic acid using Erio chrome, black T as indicator at a pH between 8.5 and 11.

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