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Chapter 26: Q4P (page 746)

Consider the separation of inorganic and organic anions in Figure.

(a) What is the probable charge (Xn-)of pyruvate (peak 10), 2-oxovalerate(peak 16), and maleate (peak 28)? (Hint: Look at the ions around the peaks in question.)

(b) Iodide (peak 44) is a-1ion. Explain its strong retention.

Short Answer

Expert verified

Polarizability:It is tendency of a compound to acquire an electric dipole moment in proportion to electric field which is applied, when a compound is exposed to an electric field.

Step by step solution

01

Solution of subpart (a) determination of charges

The probable charge (Xn-)of pyruvate (peak 10), 2-oxovalerate (peak 16), and maleate (peak 28) by looking at the ions around the peaks are as follows:

Pyruvate -1

2-oxovalerate -1

Maleate -2

02

Solution of subpart (b) retention of Iodide (peak )

The iodide ion is highly polarizable.

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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-?

Suppose that the electroosmotic mobility of a solution is +1.61×10-7m2/(V×s)) How many plates are required to separate sulfate from bromide with a resolution of 2.0? Use Table 15-1 for mobilities and Equation 26-14 for resolution.

The system in Figure 26-7 can be adapted to produce the strong acid eluent methane sulfonic acid(CH3SO3-H+). For this purpose, the polarity of the electrodes is reversed and the reservoir containsNH4+CH3SO3-. The barrier membrane and the resin bed at the bottom of the figure must both be anion-exchangers loaded withCH3SO3-.Draw this system and write the chemistry that occurs in each part.

Measure the width of theC351- peak at half-height in Figure 26-32 and calculate the plate number. The capillary length to detector was 40.0 cm. Find the plate height.

The observed behavior of benzyl alcohol (C6H5CH2OH) in capillary electrophoresis is given here. Draw a graph showing the number of plates versus the electric field and explain what happens as the field increases.
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