Unformatted text preview: change color. Note that adding
one mL of this solution does not affect the stoichiometry of the titration as the solution
contains an equal molar amount of magnesium and EDTA. Be sure to titrate all the
way to the blue color endpoint and not stop titrating when the solution is the purple
color. Keep the flask of your first trial titration to use as a reference color for
subsequent trials. Be sure you have three acceptable trials before moving on to Part II.
To determine if a trial is acceptable, calculate the molarity of the EDTA solution based
on your volumes and mass of CaCO3 for each trial and then perform the Q-test. For
more details regarding the Q-test calculation, see the introductory section of your
Question B: Write the balanced chemical equation for the reaction between the
EDTA solution and the indicator, MgIn(aq).
Perform the analysis with three samples. Calculate the molarity of the EDTA solution for
each sample. Calculate an average molarity and the standard deviation...
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This note was uploaded on 04/09/2013 for the course CHE CHE 2C taught by Professor Nasiri during the Spring '07 term at UC Davis.
- Spring '07