Here's why:

* Salt preparation: Salt (NaCl) is typically made through the evaporation of seawater or the mining of rock salt. These methods don't involve precise volumetric measurements, which is the primary function of a burette.

* Burette function: A burette is a piece of laboratory glassware used for dispensing precise volumes of liquid, usually in titration experiments. It's used for accurate delivery of solutions during chemical reactions.

If you're thinking about a different type of salt or a different chemical process, please provide more context.