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.
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