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Chapter 26: Q43P (page 749)

The migration time for Cl-in a capillary zone electrophoresis experiment is 17.12 min and the migration time for l-is 17.78 min. From mobilities in Table 15-1, predict the migration time of Br(The observed value is 19.6 min.)

Short Answer

Expert verified

Expressions for Cl-and l-is渭app=LtE

The migration time is calculated as x=20.5min

Step by step solution

01

Step 1:Expressions forCl-andl-using the following equations

We need to write the expressions for Cl-and l-using the following equations

t=L渭net=L渭appE渭app=LtE

Where t is migration time,L is length,E is electric field and is speed.

forCl-渭app=L17.2El-渭app=L17.78E

02

Step 2:Difference in mobilities

Next we write the difference in mobilities

鈭�渭appl-Cl=L17.2E-L17.78EfromTable15-lwecanseethatl-Cl=0.05脳10-8m2/Vs

03

Step 3:Difference in mobilities for  and 

ThenwewillwritethedifferenceinmobilitiesforBr-andCl-:

鈭�渭appBr-Cl=L17.2E-LxE

fromTable15-lwecanseethatBr-Cl=0.22脳10-8m2/Vs

04

Step 4:Calculate the migration time

Using step 2 and step 3 calculating the migration time

鈭�渭appBr-Cl鈭�渭l-Cl=0.220.054.4=L17.2E-LxEL17.2E-L17.78Ex=20.5min

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Most popular questions from this chapter

26-D. Consider a capillary electrophoresis experiment conducted near pH9, at which the electroosmotic flow is stronger than the electrophoretic flow.

(a) Draw a picture of the capillary, showing the placement of the anode, cathode, injector, and detector. Show the direction of electroosmotic flow and the direction of electrophoretic flow of a cation and an anion. Show the direction of net flow.

(b) Using Table 15-1, explain why CI-has a shorter migration time than I-Predict whether Br-will have a shorter migration time than CI-or a greater migration time than I-

(c) Why is the mobility of I-greater than that ofCI-?

d)Li+ has lower mobility than Na+. Explain why lithium phosphate can be used at higher electric field strength than sodium phosphate to generate the same current. What is the advantage of higher field strength for this separation?

(a) A long thin molecule has a greater friction coefficient than a short fat molecule. Predict whether fumarate or maleate will have greater electrophoretic mobility.

(b) Electrophoresis is run with the injection end positive and the detection end negative. At pH 8.5, both anions have a charge of 22.The electroosmotic fl ow from the positive terminal to the negative terminal is greater than the electrophoretic flow, so these two anions have a net migration from the positive to the negative end of the capillary in electrophoresis. From your answer to part (a), predict the order of elution of these two species. (c)At pH 4.0, both anions have a charge close to 21, and the electroosmotic fl ow is weak. Therefore electrophoresis is run with the injection end negative and the detection end positive. The anions migrate from the negative end of the capillary to the positive end.Predict the order of elution.

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