Q Ion Exchange Separations:
Complexometric Titrations
Dr. Prem D. Sattsangi
Copyright © 2009
1. Which complex is stronger? i.e., (has Least tendency to dissociate)
(a) [CoCl4]2- or (b) [CoEDTA]2- ____________
2. What are two major purposes of Murexide reagent?
__________________________ _______________________
In the application of unknown samples to the column, you are
advised to, apply the sample to the column, percolate it in. Add
twice, 1 mL of HCl, percolate it in. Then start eluting with large
amount of HCl.
What will cause the separation to be very poor if, one applies the
U.K. sample to the column and immediately starts elution with
large amount of HCl?
____________________________________________________
Suppose you collected the Copper sample from the column and diluted it to
100 mL in a volumetric flask, but failed to mix it adequately. The titration
Results would be______________.
(a) Lower than expected,
(b) Higher than expected
(c) Erratic
What is the formula and color of the following complexes?
Formula
Cobalt chloro complex
Cobalt aquo complex
Copper chloro complex
Copper aquo complex
_______________
_______________
_______________
_______________
Color
________________
________________
________________
________________
What is the purpose of adding ammonia to your sample, before titration?
_______________________________________________________
If it takes 15.30 mL of 0.0118 M EDTA to titrate 25.0 mL of your cobalt solution,
molar concentration of cobalt is_______________.
Given, atomic weight of cobalt as 58.93 g/mol, how many grams of cobalt
Are present in 100 mL of the solution.
How many 5-membered rings can you count in the Co-EDTA complex
shown on Page – 3 -, Experiment -7? __________
Draw a structure for EDTA holding Cu2+ ion