Question

why EDTA is secondary standard​

Answer 1

Answer:

In this procedure a stock solution of EDTA will be standardized against primary standard CaCO3. This standardized EDTA solution is then used to determine

Explanation:

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Answer 2

Unfortunately EDTA cannot be easily used as a primary standard. The H4Y form can be dried at 140◦C for 2 hrs and used as a primary standard, but is only sparingly soluble in water.