Sodium bisulphate, also known as sodium acid sulfate, is sodium chloride (salt) and sulfuric acid can react at high temperatures to produce a substance, anhydrous substance has hygroscopic, aqueous solution is acidic. It is a strong electrolyte, completely ionized in the molten state, ionized into sodium ions and bisulfate. Hydrogen sulfate can only self-ionization, ionization equilibrium constant is very small, can not be completely ionized.