Chemistry

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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?

• Chemistry -

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

• Chemistry -

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 = ??

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