The van Deemester equation describes plate height in terms of constants A, B, C,

Question

The van Deemester equation describes plate height in terms of constants A, B, C, and the linear velocity. Which statement is TRUE for the van Deemter equation? H = A + B/u_0 + Cu_s The A term takes into account the multiple pathways through the column and is dependent on the flow rate. The B term takes into account longitudinal diffusion of the mobile phase. This term increases with flow rate. The C term takes into account mass transport between the mobile and stationary phase. This term increases with flow rate. All of the above are true. Which column would be expected to have the best resolution between peaks? Plate height = 200 mu m; column length = 15 m plate height = 40 mu m; column length = 15 m plate height = 200 mu m; column length = 30 m plate height = 20 mu m; column length = 30 m Which of the following are correct for Beers Law? Absorbance increases as concentration increases. Absorbance decreases as pathlength increases. The molar absorptivity value is chromophore and wavelength specific. The absorption spectrum is a graph showing absorbances changes with wavelength. I, II and III II, III, and IV I, III, and IV I, II, Ill and IV

Explanation / Answer

7. Option C)

8. Option D)

Column Resolution will be highest where no. of theoretical plates is greatest.

N = L / H = 30 m / 40 m

9.

Option C) I , III and IV

Absorbance increases with path length.

A = l c

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