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Chapter 26: Q41P (page 749)

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.

Short Answer

Expert verified

When the field increases at low voltage the number of plates would increase with decreasing voltage.

Step by step solution

01

A graph showing the number of plates versus the electric field

02

Step 2:When the field increases.

At low voltage –the number of plates would increase with decreasing voltage.
Above 25000V/m the capillary could be overheating which would decrease the number of plates due to band broadening.

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Most popular questions from this chapter

26-B. Vanadyl sulfate ${VOSO}_{4}$ , FM 163.00), as supplied commercially, is contaminated with $H_{2} {SO}_{4} (FM 98.08)$ and $H_{2} O$ A solution was prepared by dissolving 0.2447g of impure ${VO}^{2 +}$ in 50.0 mL of water. Spectrophotometric analysis indicated that the concentration of the blueion was 0.0243M. A 5.00-mL sample was passed through a cation-exchange column loaded with $H^{+}$ . When ${VO}^{2 +}$ from the 5.00-mL sample became bound to the column, thereleased required 13.03mL of 0.02274M NaOH for titration. Find the weight percent of each component ${VOSO}_{4}, H_{2} {SO}_{4} and H_{2} O$ ) in the vanadyl sulfate.

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.)

Measure the width of the ${}^{35}C 1^{-}$ 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.

Measure the number of plates for the electrophoretic peak in Figure 26-20. Use Equation 23-32 for asymmetric peaks to find the number of plates for the chromatographic peak.

The system in Figure 26-7 can be adapted to produce the strong acid eluent methane sulfonic acid $({CH}_{3} {SO}_{3}^{-} H^{+})$ . For this purpose, the polarity of the electrodes is reversed and the reservoir contains ${NH}_{4}^{+} {CH}_{3} {SO}_{3}^{-}$ . The barrier membrane and the resin bed at the bottom of the figure must both be anion-exchangers loaded with ${CH}_{3} {SO}_{3}^{-}$ .Draw this system and write the chemistry that occurs in each part.

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