Question

What is the use of collodion solution in the process of ultrafiltration?

Answer 1

Answer:

• In  ultrafiltration  (the process of separating the colloidal particles from the solvent and soluble solutes) colloidal particles can pass through ordinary filter paper because the pores are too large.  
• These pores of filter paper can be reduced in size by impregnating with colloidion solution to stop the flow of colloidal particles.  
• The usual colloidion is a 4% solution of nitro- cellulose in a mixture of alcohol and ether.  
• An ultra-filter paper may be prepared by soaking the filter paper in a colloidion solution, hardening by formaldehyde and then finally drying it.  
• Thus, by using ultra-filter paper, the colloidal particles are separated from rest of the materials.

Answer 2

The use of collodion solution in the process of ultrafiltration is that it reduces the size of the pores of the filter paper so that the colloidal particles cannot pass through it.

Explanation:

• Ultrafiltration is a process of separation of impurities of different sizes from a colloidal solution.
• A normal filter paper cannot be used to separate the colloidal particles as their pore size is bigger enough and the particles can pass through them.
• Therefore, the filter paper is treated with collodion solution which reduces the size of the pores of the filter paper so that the colloidal particles cannot pass through it and only the electrolyte can pass.
• A collodion solution is a $\[4\% \]$ solution of nitrocellulose formed in a mixture of ether and alcohol.
• Thus, a collodion solution makes the filter paper fit for the process of ultrafiltration.

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