2022-02-11 Formic Acid CAS 64-18-6 is the simplest organic acid, a small amount of ants, bees in the body, so also known as "formic acid". The molecular formula is HCOOH. It is a colorless and transparent smoky liquid with a stimulating odor, soluble in water, alcohol and ether. It is an important chemical raw material with strong acidity and reducibility.