Purification of Colloids
Chemistry ⇒ Solutions and Colloids
Purification of Colloids starts at 11 and continues till grade 12.
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A colloidal solution is purified by dialysis. After some time, the conductivity of the external water increases. What does this indicate?
A colloidal solution is purified by ultrafiltration. What would you expect to find in the filtrate?
A colloidal solution of starch contains sodium chloride as an impurity. Which purification method would you use and why?
Describe how you would purify a colloidal solution containing both ionic and non-ionic impurities.
Describe the process of electrodialysis and its advantage over simple dialysis.
Describe the role of electrolytes in the stability of colloidal solutions and why their removal is important during purification.
Explain the principle of dialysis in the purification of colloids.
Explain why a semi-permeable membrane is essential in the process of dialysis.
Explain why colloidal particles cannot pass through a semi-permeable membrane during dialysis.
Explain why frequent replacement of the external water is necessary during dialysis.
Explain why the removal of electrolytes is essential for the stability of colloidal solutions.
In ultrafiltration, what is the role of pressure?
Name the process in which an electric field is used to speed up the removal of ions during dialysis.
State one advantage of using ultrafiltration over dialysis for colloid purification.
What is the main difference between dialysis and ultrafiltration in the purification of colloids?
