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Q. |
The indicator used in the EDTA method is |
A. | benzene |
B. | phenopthalene |
C. | ethylene diamine |
D. | erichrome black t |
Answer» D. erichrome black t | |
Explanation: 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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