Harris qca 8e-Ch 25 Passing a solution of Ca no



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Harris QCA 8e-Ch 25

1. Passing a solution of Ca(NO3)2 and Na2SO4 through a mixed ion-exchange resin would give an eluate that is

(a) neutral. (b) acidic.
(c) basic.

2. Passing a solution of Ca(NO3)2 and Na2SO4 through a cation exchange resin would give an eluate that is

(a) neutral. (b) acidic.
(c) basic.

3. A gel-filtration column has a radius of 0.75 cm and a length of 30.0 cm. If 70% of the volume of the column is occupied by the stationary phase and the volume inside the pores, calculate the void volume.

(a) 53.0 mL (b) 37.1 mL (c) 15.9 mL

4. In gel-permeation chromatography, there is a linear relationship between (a) retention volume and molecular mass.

(b) retention volume and log of the molecular mass.
(c) molecular mass and log of the retention volume.

5. In capillary electrophoresis

(a) anions move to the anode, cations move to the cathode, and neutral molecules do not migrate.


(b) anions and cations move to the cathode, neutral molecules do not migrate.

(c) anions, cations and neutral molecules all move to the cathode.



6. Two neutral molecules, A and B, are separated by micellar electrokinetic capillary chromatography. A is more soluble in the micelle than B. The order in which they arrive at the detector is

(a) micelle followed by A, which is followed by B.

(b) A followed by B, which is followed by the micelle.
(c) B followed by A, which is followed by the micelle.

7. A sample containing 2.00 x 10-2 mmol of CuS04 and 3.00 x 10-2 mmol of KNO3 is passed through a cation-exchange column. The volume of 0.0100 M NaOH needed to titrate the eluate is

(a) 7.00 mL.
(b) 10.00 mL.
(c) 5.00 mL.
8. A suppressor column in suppressed-ion chromatography (a) converts the analyte to a non-ionic form.

(b) converts the ionic eluent to a non-ionic form.


(c) separates the analyte components.

9. Capillary electrophoresis differs from other chromatographic methods because (a) it uses unique detectors.

(b) there is no stationary phase.


(c) it has fewer theoretical plates.

10. Binding to an ion-exchange resin is stronger for (a) ions with higher charges.

(b) ions with a larger hydrated radius.
(c) ions with a smaller “bare” radius.

11. In ion-exchange chromatography, the equilibrium constant is called


(a) the activity coefficient.

(b) the selectivity coefficient.


(c) the formation constant.
12. Three classes of ion exchangers
(a) resins, gels, and organic.

(b) resins, epoxies, and inorganic.


(c) resins, gels, and inorganic.

13. In molecular exclusion or gel permeation chromatography, large molecules (a) pass through the column slower than small molecules.

(b) pass through the column faster than small molecules.

(c) pass through the column at the same rate as small molecules.

14. What technique is based on a compound’s specific binding to the stationary phase?
(a) affinity chromatography

(b) molecular exclusion chromatography


(c) ion chromatography

15. Micellar electrokinetic chromatography separates (a) neutral molecules.

(b) neutral molecules and ions.
(c) ions.



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