In an experiment where you standardize EDTA with calciumcarbonate and then have EDTA as the titrant and zinc as the analyteto determine the amount of zinc, which of the following arepotential sources of error in the determination of the mean andrelative standard deviation for the amount of zinc in yourunknown?
Select all answers that apply.
1) Lack of homogeneity in the indicator solution
2) Not dissolving calcium carbonate completely
3) Inconsistencies in pipetting the zinc unknown
4) Systematic error in the buret calibrations
5) Failing to quantitatively transfer calcium carbonate
6) Sharing the indicator bottle
7) Over-titrating
