I need help calculating the excess concentration of C 2 O 4 2- in a gravimetric

Question

I need help calculating the excess concentration of C2O42- in a gravimetric analysis of Calcium ions.

I did an experiment where we determined the concentration of calcium in an unknown solution by using gravimetric analysis. The reaction (at equilbriuim) is Ca2+ + C2O42- + H2O(l) = CaC2O4*H2O (s). I need to calculate the excess concentration of C2O42- and im not sure where to start.

Concentration of Ca2+ was calcualated to be = 0.0561

25 ml of 0.15M NH4C2O4 was added to the mixture. Any help would be awesome!

Explanation / Answer

1000 ml of 0.15M NH4C2O4 contain 0.15 moles of C2O42-

and 25 ml of 0.15M NH4C2O4 will contain 0.00375

thus 0.05235 moles C2O42- are req in excess

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