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Which of the following statement is/are true regarding ultrafilter paper?
Ultra-filter paper is prepared by soaking the filter paper in a collodion solution.
Collodion (in which filter paper is soaked) is a 4% solution of nitrocellulose in a mixture of alcohol and ether.
Formaldehyde is used for hardening of the filter paper.
All of the above.
Answers (1)
Ultrafiltration is the process of separating colloidal particles from solvent and soluble solutes by specially prepared filters.
The filter should be permeable to all substances except the colloidal particles.
Ultra-filter paper is used for this purpose. It is prepared by soaking the filter paper in a collodion solution. It reduces the size of pores of filter paper and stops the flow of colloidal particle through it.
The usual collodion is a 4% solution of nitrocellulose in a mixture of alcohol and ether.
Formaldehyde is used for the hardening of the filter paper and then it is dried to get the ultra-filter paper.
The colloidal particles left on the ultra-filter paper are then stirred with fresh dispersion medium (solvent) to get a pure colloidal solution.
Hence option 4 is correct.
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