Question

Hello, we recently did a lab in our chemistry class to analyze an Unknown amount Calcium Carbonate which was titrated with EDTA.

Our titration results were:

mass of the unknown CaCO3 was 0.172 g and the mL of EDTA added was 30.7. How do I find the percent mass of Ca?

Answer 1

also, the Molarity of EDTA was determined to be .0404

Answer 2

moles EDTA = M x L = 0.0404 x 0.0307
moles Ca = moles EDTA
mass Ca = moles Ca x atomic mass Ca.
%Ca = (g Ca/mass sample)*100 = ??