Sodium bisulfate

Sodium bisulfate
One sodium cation and one hydrogensulfate anion	Ball-and-stick model of the component ions
Names
	IUPAC name Sodium hydrogen sulfate
	Other names Sodium acid sulfate; Bisulfate of soda; (sodiooxy)sulfonic acid
Identifiers
CAS Number	7681-38-1 ; 10034-88-5 (monohydrate) ;
3D model (JSmol)	Interactive image;
ChEMBL	ChEMBL1200488;
ChemSpider	56397 ;
ECHA InfoCard	100.028.787
EC Number	231-665-7;
E number	E514(ii) (acidity regulators, ...)
PubChem CID	516919;
RTECS number	VZ1860000;
UNII	BU8V88OWIQ ; 3KLS9Y77YJ (monohydrate) ;
UN number	2837
CompTox Dashboard (EPA)	DTXSID3033983 ;
	InChI InChI=1S/Na.H2O4S/c;1-5(2,3)4/h;(H2,1,2,3,4)/q+1;/p-1 Key: WBHQBSYUUJJSRZ-UHFFFAOYSA-M ; InChI=1/Na.H2O4S/c;1-5(2,3)4/h;(H2,1,2,3,4)/q+1;/p-1 Key: WBHQBSYUUJJSRZ-REWHXWOFAO;
	SMILES [Na+].[O-]S(=O)(=O)O;
Properties
Chemical formula	NaHSO4
Molar mass	120.06 g/mol (anhydrous); 138.07 g/mol (monohydrate)
Appearance	white solid
Density	2.742 g/cm3 (anhydrous) ; 1.8 g/cm3 (monohydrate)
Melting point	58.5 °C (137.3 °F; 331.6 K) (monohydrate) ; 315 °C (anhydrous)
Boiling point	decomposes to Na2S2O7 (+ H2O) at 315 °C (599 °F; 588 K)
Solubility in water	28.5 g/100 mL (25 °C) ; 100 g/100 mL (100 °C)
Solubility	Insoluble in ammonia
Acidity (pKa)	1.99
Structure
Crystal structure	triclinic (anhydrous) ; monoclinic (monohydrate)
Hazards
	GHS labelling:
Pictograms
Signal word	Danger
Hazard statements	H318
Precautionary statements	P280, P305+P351+P338, P310
NFPA 704 (fire diamond)	2 0 1
Flash point	Non-flammable
Safety data sheet (SDS)	External MSDS
Related compounds
Other anions	Sodium sulfate
Other cations	Potassium bisulfate
	Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa). verify (what is ?) Infobox references

Sodium bisulfate, also known as sodium hydrogen sulfate,^[a] is the sodium salt of the bisulfate anion, with the molecular formula NaHSO₄. Sodium bisulfate is an acid salt formed by partial neutralization of sulfuric acid by an equivalent of sodium base, typically in the form of either sodium hydroxide (lye) or sodium chloride (table salt). It is a dry granular product that can be safely shipped and stored. The anhydrous form is hygroscopic. Solutions of sodium bisulfate are acidic, with a 1M solution having a pH of slightly below 1.
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[a]