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5mM = 0.005 moles
100 mL = 0.1 Liters
Molarity = moles of solute/Liters of solution
0.005 M EDTA = X moles/0.1 Liters
= 0.0005 moles EDTA
=_____________ Now, look up the molecular formula for EDTA and find how many grams needed to add to your 100 mL.
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