Homework Help: analytical chemistry

Posted by Anonymous on Sunday, February 3, 2013 at 8:26am.

An EDTA solution is standardized against a solution of primary standard CaCO3 (0.5622 g dissolve in 1000 ml of solution) and titrating aliquots of it with the EDTA. If a 25.00 ml aliquot required 21.88 ml of the EDTA, what is the concentration of the EDTA?

analytical chemistry - DrBob222, Sunday, February 3, 2013 at 12:51pm
mols CaCO3 = grams/molar mass
M CaCO3 = mols/L
mol = 0.5622/100 = 0.005622 and that is in 1L; therefore M = 0.005622M.
Then I would use
MEDTA x 21.88mL EDTA = MCaCO3 x 25.00 mL CaCO3. Solve for MEDTA
analytical chemistry - JFernando, Monday, March 11, 2013 at 12:01pm
first get for the moles of CaCO3
mols CaCO3= 0.5662g*(1mol CaCO3/100gCaCO3)
Molarity of CaCO3= mols CaCO3/L of solution
=0.005622mols/1L
M EDTA= [(molarity CaCO3)(mL aliquot)]/
mL of EDTA
M EDTA= [(0.005622)(25)]/21.88
= 0.00642 M

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