Sodium bisulfate

Sodium bisulfate, also known as sodium hydrogen sulfate, 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.

Not to be confused with Sodium bisulfite.
Sodium bisulfate
Names
IUPAC name
Sodium hydrogen sulfate
Other names
Sodium acid sulfate
Bisulfate of soda
(sodiooxy)sulfonic acid
Identifiers
3D model (JSmol)
ChEMBL
ChemSpider
ECHA InfoCard 100.028.787
EC Number
  • 231-665-7
E number E514(ii) (acidity regulators, ...)
RTECS number
  • VZ1860000
UNII
UN number 2837
  • InChI=1S/Na.H2O4S/c;1-5(2,3)4/h;(H2,1,2,3,4)/q+1;/p-1 Y
    Key: WBHQBSYUUJJSRZ-UHFFFAOYSA-M Y
  • InChI=1/Na.H2O4S/c;1-5(2,3)4/h;(H2,1,2,3,4)/q+1;/p-1
    Key: WBHQBSYUUJJSRZ-REWHXWOFAO
  • [Na+].[O-]S(=O)(=O)O
Properties
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)
28.5 g/100 mL (25 °C)
100 g/100 mL (100 °C)
Solubility Insoluble in ammonia
Acidity (pKa) 1.99
Structure
triclinic (anhydrous)
monoclinic (monohydrate)
Hazards
GHS labelling:
Danger
H318
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).
Y verify (what is YN ?)
Infobox references
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