Purchase Solution

Chemical Separations Problem

Not what you're looking for?

Ask Custom Question

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

Purchase this Solution

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 ...

Purchase this Solution


Free BrainMass Quizzes
Organic Chemistry Naming: Alkanes

This is a quiz which is designed to assist students with learning the nomenclature used to identify organic compounds. This quiz focuses on the organic compounds called Alkanes.

Thermochemistry

The quiz helps in revising basic concepts about thermochemistry.

Functional groups in Organic Chemistry

You will be tested on the names of functional groups in Organic Chemistry. It is very important to know the functional groups to understand Organic reactions.

General Chemistry - Classification of Matter

This test will assess your knowledge on the classification of matter which includes elements, compounds and mixtures.