Sodium diacetate is primarily used as a preservative and acidity regulator in the food industry, where it carries the designation $\text{E 262 ii}$. One of its most important applications is the preservation of bread and bakery products, where it effectively inhibits the growth of rope (bacteria that spoil bread) and mold. It is also used to extend the shelf life of meat and sausage products. Furthermore, in animal nutrition, it serves as a feed preservative to control microbial contamination. In chemical analysis, it is used for the preparation of buffer solutions because it can stabilize the $\text{pH}$ value of solutions.