In a reaction between glycerol (also known as glycerin) and acetic acid, one of the possible reactions is the formation of glycerol triacetate (also known as triacetin). This reaction is an example of an esterification reaction, where an alcohol (in this case, glycerol) reacts with a carboxylic acid (in this case, acetic acid) to form an ester (triacetin) and water. The overall reaction can be represented as follows:

Glycerol + 3 Acetic acid → Glycerol triacetate + 3 Water

Here, one molecule of glycerol reacts with three molecules of acetic acid to produce one molecule of glycerol triacetate and three molecules of water. Glycerol triacetate is a colourless, viscous liquid that has a mild, sweet odour and is commonly used as a food additive, particularly as a plasticizer and a solvent for flavours and fragrances.