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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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