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Chapter 23: Q18P (page 629)

The partition coefficient for a solute in chromatography is K=cs/cm, where csis the concentration in the stationary phase and cmis the concentration in the mobile phase. The larger the partition coefficient, the longer it takes a solute to be eluted. Explain why.

Short Answer

Expert verified

concentration in stationary phase increases there is more concentration that needs to be extracted to the mobile phase and the elution would be longer.

Step by step solution

01

Given Information:

The Partition coefficient for a solute is K=cs/cm

02

Partition coefficient is larger :

The given equation is K=cs/cm

The concentration of the solute in the stationary phase is csproportional to the partition coefficient K

If a concentration in stationary phase increases there is more concentration that needs to be extracted to the mobile phase and the elution would be longer.

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Most popular questions from this chapter

An open tubular column is 30.01 mlong and has an inner diameter of 0.530mm. It is coated on the inside wall with a layer of stationary phase that is3.1渭尘thick. Unretained solute passes through in 2.16min, whereas a particular solute has a retention time of 17.32min. (a) Find the linear velocity and volume flow rate. (b) Find the retention factor for the solute and the fraction of time spent in the stationary phase.(c) Find the partition coefficient, K 5 cs/cm, for this solute.

23-38. What is the optimal flow rate in Figure 23-17 for best separation of solutes?

Solute S has a partition coefficient of 4.0 between water (phase 1) and chloroform (phase 2) in Equation 23-1.

(a) Calculate the concentration of in chloroform if[S]aqis 0.020M.

(b) If the volume of water is 80.0 mL and the volume of chloroform is 10.0 mL, find the quotient localid="1654852656619" (molSinchloroform)(molSinwater).

(a) A chromatography column with a length of 10.3 cmand inner diameter of 4.61mmis packed with a stationary phase that occupies 61.0% of the volume. If the volume flow rate is 1.13mL, find the linear velocity in cm/min.(b) How long does it take for solvent (which is the same as unretained solute) to pass through the column? (c) Find the retention time for a solute with a retention factor of 10.

Find the retention factors for octane and nonane in figure 23-7. What you measure distances , estimate them to the nearest 0.1mm.

(b) Find the ratiotimeoctanespendsinstationaryphasetoatltimeoctanespendsoncolumn

(c) Find the Relative retention for octane and nonane.

(d) Find the partition coefficient for Octane by assuming that the volume of the stationary phase equals half the volume of the mobile phase.
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