Purification of Colloids
Chemistry ⇒ Solutions and Colloids
Purification of Colloids starts at 11 and continues till grade 12.
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Describe how ultracentrifugation can be used to purify colloidal solutions.
Describe the effect of adding a small amount of electrolyte to a colloidal solution before purification.
Describe the effect of temperature on the rate of dialysis.
Describe the main difference between dialysis and ultrafiltration in the purification of colloids.
Describe the role of a semipermeable membrane in the purification of colloids.
Explain the principle of ultrafiltration in the purification of colloids.
Explain why colloidal solutions are not stable in the presence of high concentrations of electrolytes.
Explain why colloidal solutions need to be purified before use in industries or medicine.
Which method is most suitable for the removal of both dissolved and undissolved impurities from a colloidal solution?
(1) Dialysis
(2) Ultrafiltration
(3) Decantation
(4) Filtration through filter paper
Which of the following is a common application of purified colloidal solutions?
(1) Paints
(2) Medicines
(3) Food products
(4) All of the above
Which of the following is a disadvantage of dialysis?
(1) It is a slow process
(2) It requires high temperature
(3) It destroys colloidal particles
(4) It cannot remove electrolytes
Which of the following is a limitation of ultrafiltration?
(1) It cannot remove colloidal particles
(2) It requires special membranes
(3) It is not effective for large particles
(4) It increases the concentration of impurities
Fill in the blank: In ultrafiltration, the filter used is called __________ membrane.
Fill in the blank: The process of purification of colloids by repeated dilution and decantation is called __________.
Fill in the blank: The process of removing impurities from a colloidal solution is called __________.
Fill in the blank: The process of removing ions from a colloidal solution by passing an electric current through it is called __________.
State True or False: The process of dialysis can be used to separate colloidal particles from macromolecules.
State True or False: The process of ultrafiltration can be used to concentrate colloidal solutions as well as purify them.
State True or False: Ultrafiltration can remove both colloidal particles and dissolved ions from a solution.
True or False: Dialysis is a process used to remove electrolytes from colloidal solutions.
