Sodium bisulfate is a sodium salt with the chemical formula NaHSO4. Chemically, it is an acid salt. As opposed to neutral salts formed in acid-base neutralization reactions, acid salts are salts formed by partial neutralization of acids, which leaves one or more hydrogen atoms intact. As can be guessed from the name and the formula, it is formed by the partial neutralization of sulfuric acid (H2SO4) by a sodium compound such as sodium hydroxide (NaOH) or sodium chloride (NaCl).
Sodium bisulfate is a white powder. The monohydrate form is granular, whereas the anhydrous form is a hygroscopic amorphous powder. However, it is not violently hygroscopic like phosphorus compounds, and the property doesn't become a significant hindrance in its storage and transport.
Sodium bisulfate is a preferred inorganic acid. Preferably, the acid is substantially completely dissolved and is substantially uniformly distributed throughout the animal feed. In a preferred method, the animal feed is treated by mixing the animal feed with a dry acid and applying steam to the mixture. An animal feed composition contains a feed grain and an inorganic acid having a pKa from 1.0 to 5.0, where the acid is present in an amount sufficient to reduce the pH of the animal feed to less than 4.5.