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 $l^{-} is μ_{app} = \frac{L}{tE}$

The migration time is calculated as x=20.5min

Step by step solution

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

We need to write the expressions for ${Cl}^{-}$ and $l^{-}$ using the following equations

$t = \frac{L}{μ_{net}} = \frac{L}{μ_{app} E} μ_{app} = \frac{L}{tE}$

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

$for {Cl}^{-} μ_{app} = \frac{L}{17.2 E} l^{-} μ_{app} = \frac{L}{17.78 E}$

Step 2:Difference in mobilities

Next we write the difference in mobilities

$∆ μ_{app} (l - Cl) = \frac{L}{17.2 E} - \frac{L}{17.78 E}$ $from Table 15 - l we can see that (l - Cl) = 0.05 \times 10^{- 8} m^{2} / Vs$

Step 3:Difference in mobilities for and

$Then we will write the difference in mobilities for {Br}^{-} and {Cl}^{-} :$

$∆ μ_{app} (Br - Cl) = \frac{L}{17.2 E} - \frac{L}{xE}$

$from Table 15 - l we can see that (Br - Cl) = 0.22 \times 10^{- 8} m^{2} / Vs$

Step 4:Calculate the migration time

Using step 2 and step 3 calculating the migration time

$\frac{∆ μ_{app} (Br - Cl)}{∆ μ (l - Cl)} = \frac{0.22}{0.05} 4.4 = \frac{\frac{L}{17.2 E} - \frac{L}{xE}}{\frac{L}{17.2 E} - \frac{L}{17.78 E}} x = 20.5 \min$

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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

Step by step solution

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

Step 2:Difference in mobilities

Step 3:Difference in mobilities for and

Step 4:Calculate the migration time

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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

Step by step solution

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

Step 2:Difference in mobilities

Step 3:Difference in mobilities for and

Step 4:Calculate the migration time

One App. One Place for Learning.

Most popular questions from this chapter

Recommended explanations on Chemistry Textbooks

The Earths Atmosphere

Chemical Analysis

Making Measurements

Physical Chemistry

Nuclear Chemistry

Chemistry Branches

Study anywhere. Anytime. Across all devices.

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.)