# Chemical Separations Problem

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The H (height equivalent of a theoretical plate) value for an HPLC column at mobile phase flow rates of 1ml/min, 3ml/min and 4ml/min are 4.1mm, 4.7mm and 5.675mm. Calculate:

1. The van Deemter parameters A, B and C

2. The flow rate at which H is a minimum and the value of H at this flow rate

3. The efficiency N if the length of the column is 18cm

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##### Solution Summary

You have three unknowns and three simultaneous equations H = A + B/u + C(u) where H is the plate heights, u is the flow rates and A, B, C are unknown.

##### Solution Preview

You have three unknowns and three simultaneous equations.

H = A + B/u + C(u)

where H is the plate heights, u is the flow rates and A, B, C are unknown.

The equations become:

4.1 = A + B/1 + C(1) or multiply out 1 4.1 = A + B + C

the next equation is:

4.7 = A + B/3 + C(3) multiply sides by 3 14.1 = 3A ...

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