Q#
Question Text
6) Data Entry  No Scoring
In the standardization of the sodium EDTA solution using the solid calcium carbonate primary standard,
we must examine each of three acceptable trials. Enter the precise mass in
GRAMS
of the dry primary
standard, calcium carbonate, used for each of 3 acceptable trials in the standardization titration.
Your mass precision should be reported to a thousandth of a gram.
Your Answer:
0.0890
No Points Possible
Your Answer:
0.0930
No Points Possible
Your Answer:
0.0910
No Points Possible
7) Data Entry  No Scoring
In the standardization of the sodium EDTA solution using the solid calcium carbonate primary standard,
your titration volumes of the sodium EDTA solution should be approximately 20  30 mL.
For each of the 3 acceptable trials used in the titration of your calcium carbonate samples, enter the
precise volume in milliliters of EDTA solution (e.g. 20.34 mL).
Be sure to enter your volumes in the corresponding order that you entered your masses of calcium
carbonate previously. For instance, the mass of calcium carbonate you entered for entry #1 below should
correspond to the volume of EDTA solution that you enter for entry #1 here.
Your Answer:
21.90
No Points Possible
Your Answer:
27.70
No Points Possible
Your Answer:
28.70
No Points Possible
8) Scoring Scheme: 3321
Using the volumes of sodium EDTA solution you just entered and the corresponding calcium carbonate
masses entered earlier, calculate the molarity of the sodium EDTA solution for each trial.
Enter your calculated molarity of the EDTA solution for each trial.
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 Summer '08
 Enderle
 Chemistry, Deviation, Calcium carbonate, dry unknown sample

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