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  4. How many EDTA (ethylenediaminetetra acetic acid) molecules are required to make an octahedral complex with a Ca2+ ion ?

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Q. How many EDTA (ethylenediaminetetra acetic acid) molecules are required to make an octahedral complex with a $Ca^{2+}$ ion ?

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Solution:

EDTA (Ethylenediaminetetra acetic acid)
It is hexadentate (6 electron pairs) that's why for octahedral complex only one EDTA is required.

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