Constituent substances of a colloid cannot be separated by ordinary filtration. Give reason.

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Constituent substances of a colloid cannot be separated by ordinary filtration. Give reason.

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Constituent substances of a colloid cannot be separated by ordinary filtration because the size of the particles in a colloid (or colloidal solution) is bigger than those in a true solution but smaller than those in suspension. It is between 1 nm to 100 nm in diameter. The size of ordinary filter paper is more than 100 nm due to which colloidal particles are passed through the pores of a filter paper. Due to which, we prefer to use ultrafilter paper so that, filtration of colloidal particles takes place easily.

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