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Surface Chemistry

Short Answer Type

191. Define ultrafiltration.

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192. Define peptization.

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193. What is an adsorption isotherm?

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194. On passing H₂S gas through dilute HNO₃ the colourless solution becomes turbid, why?

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195. What is the function of emulsifying agent?

Answer:

Emulsifying Agents are the substances added to an emulsion to prevent the coalescence of the globules of the dispersed phase. They are also known as emulgents or emulsifiers. They act by reducing the interfacial tension between the two phases and forming a stable interfacial film. The choice of selection of emulsifying agent plays a very important role in the formulation of a stable emulsion.
Substances that are soluble in both fat and water and enable fat to be uniformly dispersed in water as an emulsion.

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