Home › Chemicals › Sodium Bisulfate CAS 7757-81-5: Sodium Bisulfate (NaHSO4) Identity CAS Number 7757-81-5 Molecular Formula NaHSO4 IUPAC Name sodium hydrogen sulfate Molecular Weight 120.06 g/mol SMILES [Na+].[O-]S(=O)(=O)OSynonyms sodium acid sulfate, niter cake, NaHSO4, dry acid
2D Structure
Physical Properties Density 2.435 g/mL at 25°C Boiling Point None°C Melting Point 315.0°C Flash Point None°C Vapor Pressure 0.0 kPa at 20°C Refractive Index nD = 1.458 Dielectric Constant ε = 7.0
Safety & GHS Classification GHS05
H314: Causes severe skin burns and eye damage Storage: Store in dry, tightly sealed containers. Strongly acidic — avoid contact with bases (vigorous reaction). Keep away from metals (corrosive). Use PPE when handling.
Material Compatibility Matrix Plastics Material Rating PTFE Excellent PVC Good PE Good PP Excellent PEEK Excellent PVDF Excellent
Rubbers Material Rating Viton Good NBR Fair EPDM Good Silicone Good FKM Good
Metals Material Rating Stainless 316 Good Aluminum Poor Copper Poor Brass Poor
Applications Swimming pool pH reducer Metal pickling and cleaning Food additive (E222 — acidulant) Descaling agent Water treatment Textile dyeing assistant Laboratory reagent Pet food palatability enhancer External References: PubChem
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