Which of the following is NOT a chemical commonly associated with the illicit manufacturing of methamphetamine?

Sodium chloride, commonly known as table salt, is not a chemical typically associated with the illicit manufacturing of methamphetamine. The production of methamphetamine requires specific chemical precursors and reagents that facilitate reactions unique to the synthesis of this drug.

Lye (sodium hydroxide) is often used in the process to help with the extraction and purification of meth. Iodine crystals may be employed in specific synthesis methods as a reagent. Isopropyl alcohol can also be part of the manufacturing process, often used for cleaning or as a solvent.

In contrast, sodium chloride does not have a role in the chemical processes involved in meth synthesis and is mainly used for seasoning or preserving food, which distinguishes it from the other substances listed. Therefore, the identification of sodium chloride as not being involved in methamphetamine production is sound within the context of understanding the chemical processes of illicit drug manufacturing.