... cm3, melting point:622°C, free soluble in water, aqueous solution appears acid. It is a kind of inorganic surface active ... , water softener, leather pre-tanning agent, dye auxiliary agent, and dispersant of suspension such as paint, kaolin, magnesium oxide, calcium ... mud, preservative agent for paper making, organic synthesis catalyzer, and used in epuration of petroleum product, gum latex storage, as ...