Item: Sodium metabisulfite Appearance: white or light yellow crystal Molecular Formula: Na2S2O5 Molecular Weight: 190.10 CAS NO:7681-57-4 ... water,the solution is acidic.Usages: Fiber, photo ,pharmacy,chemical ,petroleum chemical and so on. Packing: 25kg PE bag or 1000kg/ ... water,the solution is acidic.Usages: Fiber, photo ,pharmacy,chemical ,petroleum chemical and so on. Packing: 25kg PE bag or 1000kg/ ...