Ammonium Acetate CAS 631-61-8 Product Introduction Ammonium acetate (CH3COONH4, CAS 631-61-8) is a white, hygroscopic crystalline salt produced by the neutralization of high-purity acetic acid with ammonia. It is one of the most widely used buffering salts in analytical chemistry and HPLC because its aqueous solutions maintain a stable pH near 7 and are fully volatile under freeze-drying. Zorui supplies ammonium acetate in 98% min assay with low heavy-metal content, available