Which of the following is a common emulsifying agent?

An emulsifying agent is a substance that helps stabilize an emulsion, which is a mixture of two immiscible liquids, such as oil and water. The role of an emulsifier is to reduce the surface tension between the two liquids, promoting the dispersion of one liquid in the other.

Span, also known as sorbitan esters, is a well-known emulsifier, particularly in food and pharmaceutical formulations. It can effectively stabilize emulsions by providing a hydrophilic-lipophilic balance (HLB) that allows it to interact with both the aqueous and oily phases, thus preventing separation. Span is often used in low HLB emulsions, making it a preferred choice in creating stable mixtures of water and oil.

The other options, while they may have some properties related to emulsification, do not primarily function as emulsifying agents. Glycerin, for example, is often used as a humectant and solvent rather than an emulsifier. Sucrose acts as a sweetener and does not have emulsifying properties. Gelatin can stabilize emulsions to some extent but is primarily known for its gelling properties rather than as a consistent emulsifier.

Therefore, the selection of Span as a common emulsifying agent is appropriate due