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Chapter 26: Q6P (page 746)

Propose a scheme for separating trimethylamine, dimethylamine, methylamine, and ammonia from one another by ion-exchange chromatography.

Short Answer

Expert verified

Principle of ion-exchange chromatography:Molecules are separated because of difference in their charges and are eluted with a solution which has a varying ionic strength. When that kind of solution passes through the column the molecules are highly separated according to their different charges.

Step by step solution

01

Order of separation of molecules

Molecules will be separated in the following order:

Ammonia < trimethylamine < methylamine < dimethylamine due topKa their values.

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Most popular questions from this chapter

Figure 26-24 shows the effect on resolution of increasing voltage from 28 to120kV

(a) What is the expected ratio of migration times(t120kV/t28kV)in the two experiments? Measure the migration times for peak 1 and find the observed ratio.

(b) What is the expected ratio of plates (N120kv/N28kv)in the two experiments?

(c) What is the expected ratio of bandwidths(蟽120kv/蟽28kv)?

(d) What is the physical reason why increasing voltage decreases bandwidth and increases resolution?

A gel filtration column has a radius, y.of 0.80 cm and a length,l, of 20.0 cm

(a).Calculate the volume,Vtof the column, which is equal to蟺谤2

(b). The interstitial volumeV0was 18.1 mL and the total volume of mobile phase was 35.8 mL.

Find.Kavfor a solute eluted at 27.4 mL.

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Figure 26-23 shows the separation of substituted benzoates. There is a peak of unknown identity at 86.0 seconds. (a) Is the unknown a cation, neutral, or an anion? (b) Find the apparent mobility and electrophoretic mobility of the unknown peak.

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