Principles of Instrumental Analysis
Principles of Instrumental Analysis
7th Edition
ISBN: 9781305577213
Author: Douglas A. Skoog, F. James Holler, Stanley R. Crouch
Publisher: Cengage Learning
Question
Book Icon
Chapter 30, Problem 30.1QAP
Interpretation Introduction

Interpretation:

The meaning of electroosmotic flow and the reason for itsoccurrence needs to be explained.

Concept introduction:

When electric field is applied in a liquid, the ions present in the liquid moves under the influence of potential gradient. This flow of liquid is termed as electroosmotic flow. It is most obvious is those having small channels. It occurs in buffered solutions and natural water.

Expert Solution & Answer
Check Mark

Answer to Problem 30.1QAP

Electroosmotic flow of liquid is caused by gradient in potential across the capillary tube on the flowing liquid that has dissolved ions. This is caused when the capillary walls get electrically charged.

Explanation of Solution

When a capillary tube is filled with fluid having dissolved ions, and electrical field is applied, the buffer ions move to respond to the electrical charges. As the solvent which is water is neutral, it remains stationary and the fluid ions move towards its electrodes with respect to the charges applied. Below is depiction of movement of electrons:

Principles of Instrumental Analysis, Chapter 30, Problem 30.1QAP

There is coulombic force induced by charges of ions in the solution wherein its net mobile charge causes electroosmotic flow. During this process of maintaining chemical equilibrium between the solid surface and solution, there is a layer of mobile ions termed as Debye layer that forms near the interface. Hence, by applying electric field to fluid the net charge in the layer gets induced and starts to move resulting in a coulomb force. This force is called electroosmotic flow.

Conclusion

Electroosmotic flow of liquid is caused due to a potential gradient across the capillary tube on the flowing liquid containing dissolved ions. This is caused when the capillary walls get electrically charged due to the application of electric field from outside.

Want to see more full solutions like this?

Subscribe now to access step-by-step solutions to millions of textbook problems written by subject matter experts!
Students have asked these similar questions
What is the kinetic property observed in suspension? What is the optical property observed in solutions?
Give example and explanation of each words: Standard Solution Supernatant liquid Abscissa Atomic mass Concentration Density Equilibrium Constant Formula mass
When pure furfural (solvent) is added to a mixture containing 0.2 mass fraction diphenylhexane and 0.8 mass fraction docosane, two separate layers can be obtained. If the composition of the two layers are as shown in the table, how much solvent was added to 500 kg of solution of docosane and diphenylhexane?
Knowledge Booster
Background pattern image
Similar questions
SEE MORE QUESTIONS
Recommended textbooks for you
  • Text book image
    Chemistry: Matter and Change
    Chemistry
    ISBN:9780078746376
    Author:Dinah Zike, Laurel Dingrando, Nicholas Hainen, Cheryl Wistrom
    Publisher:Glencoe/McGraw-Hill School Pub Co
    Text book image
    Physical Chemistry
    Chemistry
    ISBN:9781133958437
    Author:Ball, David W. (david Warren), BAER, Tomas
    Publisher:Wadsworth Cengage Learning,
Text book image
Chemistry: Matter and Change
Chemistry
ISBN:9780078746376
Author:Dinah Zike, Laurel Dingrando, Nicholas Hainen, Cheryl Wistrom
Publisher:Glencoe/McGraw-Hill School Pub Co
Text book image
Physical Chemistry
Chemistry
ISBN:9781133958437
Author:Ball, David W. (david Warren), BAER, Tomas
Publisher:Wadsworth Cengage Learning,