Capillary Zone Electrophoresis, Molar Solubility and Titrations
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1. Give an example of an absorption type stationary phase.
3. Explain why at pH around 7, the analyte anions move towards the cathode in capillary zone electrophoresis.
4. The Ksp of La(IO3)3 is 1.0×10-11. Using activities, what is the molar solubility of La(IO3)3 in a 0.050 M solution of NaNO3?
5. Calculate pFe2+ at Ve in the titration of 25.00 mL of 0.02026 M EDTA by 0.03855 M Fe2+ at pH 6.00.
A solution containing 100.0 mL of 0.150 M HCl is titrated with 75.0 mL of 0.300 NaOH. What is the pH of the resulting solution?
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Solution Summary
This solution:
1) Gives an example of an absorption type stationary phase.
2) Explains why at pH 7, anions move towards the cathode in capillary zone electrophoresis.
3) Explains how to calculate molar solubility of a compound using activities.
4) Calculates concentration of iron in an EDTA titration.
5) Calculates the pH of a solution in a titration.
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2. Give an example of an absorption type stationary phase.
An example of an absorption type stationary phase is silica gel in TLC or column chromatography. The particles of the mobile phase will be absorbed by the silica and then reabsorbed by the solvent as it travels through the column.
3. Explain why at pH around 7, the analyte anions move towards the cathode in capillary zone electrophoresis.
In CZE, it is expected that the anions which are negative would move towards the anode, which is positive. The anions will be drawn to the cathode due to electroosmotic flow though. Because the solution (which has some positive particles drawn to the cathode) is moving towards the cathode, the anions will ...
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