7.In the van Deemter equation, H=A + B/ux+ Cux, which of the following is true? A)...
7.In the van Deemter equation, H=A + B/ux+ Cux, which of the following is true?
A) The mass transfer term, referring to equilibration time, is proportional to flow rate.
B) The parameters A, B, and C, depend on the stationary phase only.
C)The longitudinal diffusion term is constant across linear flow rates.
D) The multiple path term is important for open tubular columns.
E) The term A = 0 for packed columns.
Homework Answers
The true statement is
A) The mass transfer term, referring to equilibrium time , is proportional to flow rate.
As the mass transfer term C increases linearly with Mobile phase velocity
The parameters A,B, and C depend on many factors including the mobile phase , column packing particle size , pore sizes, temperature diffusion coefficient etc so not on the stationary phase only.
The longitudinal diffusion term is also dependent on
diffusion coefficient and temperature so it can't be constant
The term A= 0 for column which are not packed.
Add Answer to:
7.In the van Deemter equation, H=A + B/ux+ Cux, which of the
following is true?
A)...
The van Deemter plot (a) Sketch and fully label a van Deemter plot for gas chromatography. (b) Sketch and fully label a van Deemter plot for liquid chromatography. (c) Point out the important differe...
The van Deemter plot (a) Sketch and fully label a van Deemter plot for gas chromatography. (b) Sketch and fully label a van Deemter plot for liquid chromatography. (c) Point out the important differences between the two graphs in (a) and (b). (d) The shape of the plots in (a) and (b) are often described based on four variables. Describe these variables and their contribution to the van Deemter curve. (e) One of the variables is negligible or non-existent for...
11. The van Deemter equation H=A+B/u + Cu describes the efficiency of chromatographic columns II. relationship...
11. The van Deemter equation H=A+B/u + Cu describes the efficiency of chromatographic columns II. relationship between the plate height and the linear velocity of the mobile phase III. sources of peak broadening A. I B. I and II C. I and III D. II and III E. I. II and III
Pls explain (a-e) in brief and provide the answer Which of the following parameters can be...
Pls explain (a-e) in brief and provide the answer
Which of the following parameters can be improved by decreasing the particle size of a packed HPLC column a) Eddy diffusion b) Longitudinal diffusion c) Reverse osmosis d) Resistance to mass transfer in mobile phase e) Resistance to mass transfer in stationary phase
summatize the following info and break them into differeng key points. write them in yojr own...
summatize the following info and break them into differeng key points. write them in yojr own words
apartus
6.1 Introduction—The design of a successful hot box appa- ratus is influenced by many factors. Before beginning the design of an apparatus meeting this standard, the designer shall review the discussion on the limitations and accuracy, Section 13, discussions of the energy flows in a hot box, Annex A2, the metering box wall loss flow, Annex A3, and flanking loss, Annex...
The van Deemter plot (a) Sketch and fully label a van Deemter plot for gas chromatography. (b) Sketch and fully label a van Deemter plot for liquid chromatography. (c) Point out the important differences between the two graphs in (a) and (b). (d) The shape of the plots in (a) and (b) are often described based on four variables. Describe these variables and their contribution to the van Deemter curve. (e) One of the variables is negligible or non-existent for...
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Pls explain (a-e) in brief and provide the answer
Which of the following parameters can be improved by decreasing the particle size of a packed HPLC column a) Eddy diffusion b) Longitudinal diffusion c) Reverse osmosis d) Resistance to mass transfer in mobile phase e) Resistance to mass transfer in stationary phase
summatize the following info and break them into differeng key points. write them in yojr own words
apartus
6.1 Introduction—The design of a successful hot box appa- ratus is influenced by many factors. Before beginning the design of an apparatus meeting this standard, the designer shall review the discussion on the limitations and accuracy, Section 13, discussions of the energy flows in a hot box, Annex A2, the metering box wall loss flow, Annex A3, and flanking loss, Annex...
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