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How much Fe in FeEDTA?

What's the fraction Fe by FeEDTA?
I have some FeEDTA, CuSO4+5H2O, ZnSO4+7H2O, H3BO3 and sources of Mo, Mn.
What do they use for Mo an Mn source in hydroponics?

EDTA has 4H's, 4O's 2N's. but when it form FeEDTA, it lose it's four H's.
and it become   ? + [Fe(+3)(EDTA)]-
if so... then what do they use for cation?
Na? K?

Help me.... please...