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1508-01-0 is the assigned Chemical Abstracts Service (CAS) number for acetic acid, which is the main active ingredient in apple cider vinegar (ACV). Acetic acid is a colorless liquid with a characteristic pungent vinegar-like odor. It is a weak acid, with a pH of around 2.4-2.6. Acetic acid is produced naturally by the fermentation of sugars, and is a major component of vinegar. In ACV, the acetic acid is combined with other compounds such as malic and tartaric acids, as well as many other vitamins, minerals, and amino acids.