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Chapter 23: Q3P (page 629)

If you wish to extract aqueous acetic acid into hexane, is it more effective to adjust the aqueous phase to or ?

Short Answer

Expert verified

When the pH is adjusted to 8, it becomes a basic solution and acetic acid would be in its anionic form.

Step by step solution

01

of 2

Let us determine whether it is more effective to adjust the aqueous phase to pH3orpH8 if we intend to extract aqueous acetic acid into hexane.

02

0f 2

Now, let us adjust the aqueous phase to pH=3

  • The acetic acid has a low localid="1654834546504" pH,and as we said before - similar dissolves in similar
  • When the pH gets adjusted to 8, this would be a basic solution and acetic acid would be in its anionic form.
  • It is to be noted that we didn鈥檛 want an anion, but the acid in its original form.
  • Result :
    When we extract aqueous acetic acid into hexane andpH is adjusted to 8, it becomes a basic solution and acetic acid would be in its anionic form.

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Most popular questions from this chapter

For the separation of A and B by column 2 in Problem 23-32:

(a) If broadening is mainly due to longitudinal diffusion, how should the flow rate be changed to improve the resolution?

(b) If broadening is mainly due to the finite equilibrium time, how should the flow rate be changed to improve the resolution?

(c) If broadening is mainly due to multiple flow paths, what effect will flow rate have on the resolution?

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.

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.

Butanoic acid has a partition coefficient of 3.0 (favouring benzene) when distributed between water and benzene. Find the formal concentration of butanoic acid in each phase when 100mL of 0.10M aqueous butanoic acid is extracted with 25mL of benzene (a) at pH 4.00 and (b) at pH 10.00.

(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.
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