Sodium sulfate

Athanor · official

Na₂O₄S · 142.04 g/mol

IUPAC name: disodium;sulfate

Also called Glauber salt, salt cake, E514, disodium sulfate

Inorganic

Open in Athanor

Drawn from its SMILES with RDKit

Names and identifiers

IUPAC name: disodium;sulfate
Synonyms: Glauber salt, salt cake, E514
+ 39 more
disodium sulfate, Disodium sulfate, Sodium sulfate anhydrous, Sodium sulfate, anhydrous, Salt cake, Sodium sulphate, Sulfuric acid disodium salt, Disodium sulphate, Sodium sulphate anhydrous, Sodium sulfate (2:1), Bisodium sulfate, Sodium sulfate, dried, Anhydrous sodium sulfate, Disodium monosulfate, Dibasic sodium sulfate, Sodium sulphate, anhydrous, Sodium sulfate (Na2SO4), Mirabilite, Natriumsulfat, DTXSID1021291, 36KCS0R750, NSC-403914, DTXCID601291, CHEBI:32149, Sulfuric acid disodium salt, anhydrous, natrii sulphas, Glaubers salt, Nat Sulph, Natrum Sulph 3X, Nat Sulph 3X, NATRUM SULPH, Natrum Sulphuricum 6X, RefChem:6690, Natrum sulphuricum 30C, NAT SULPH 6X, TONICPET 11, Natrum Sulphuricum 8011, BQCELL REVIRGIN GUNG, NATRIUM SULFURICUM 6X
Molecular formula: Na₂O₄S
Empirical formula: Na₂O₄S
Molecular weight: 142.04 g/mol
Exact mass: 141.93127
CAS number: 7757-82-6
PubChem CID: 24436
Canonical SMILES: [O-]S(=O)(=O)[O-].[Na+].[Na+]
Isomeric SMILES: [O-]S(=O)(=O)[O-].[Na+].[Na+]
InChI: InChI=1S/2Na.H2O4S/c;;1-5(2,3)4/h;;(H2,1,2,3,4)/q2*+1;/p-2
InChIKey: PMZURENOXWZQFD-UHFFFAOYSA-L
Molfile

Names, InChI and the identifiers from PubChem, retrieved 2026-10-14.

Physical properties

TemperaturePressureDensity

Appearance: Large Crystals; CBI; Dry Powder; Wet Solid; Dry Powder; Gas Vapor; Wet Solid; Other Solid; Dry Powder; Large Crystals; Liquid; Liquid; Dry Powder; Liquid; Liquid; Other Solid; Dry Powder; Large Crystals[1]
2 values
From EPA Chemical Data Reporting (CDR), the most authoritative source here.
Value As written Source
–shown Large Crystals; CBI; Dry Powder; Wet Solid; Dry Powder; Gas Vapor; Wet Solid; Other Solid; Dry Powder; Large Crystals; Liquid; Liquid; Dry Powder; Liquid; Liquid; Other Solid; Dry Powder; Large Crystals [1] EPA Chemical Data Reporting (CDR)
– WHITE HYGROSCOPIC SOLID IN VARIOUS FORMS. [2] ILO-WHO International Chemical Safety Cards (ICSCs)
Odor: Odorless[3]
Melting point: 884 °C[2]
2 values
Sources disagree; from ILO-WHO International Chemical Safety Cards (ICSCs), the most authoritative.
Value As written Source
884 °Cshown 884 °C [2] ILO-WHO International Chemical Safety Cards (ICSCs)
888 °C 888 °C [4] PAC Chemical Database, U.S. Department of Energy
1 more value was reported but failed the checks (unreadable or out of range), so it is not shown.
Density: 2.671[3]
3 values
3 of 3 sources agree on it (most common value).
Value As written Source
–shown 2.671 [3] Hazardous Substances Data Bank (HSDB)cites Larranaga, M.D., Lewis, R.J. Sr., Lewis, R.A.; Hawley's Condensed Chemical Dictionary 16th Edition. John Wiley & Sons, Inc. Hoboken, NJ 2016., p. 1254
– Relative density (water = 1): 2.7 [2] ILO-WHO International Chemical Safety Cards (ICSCs)
– 2.671 @25 °C [4] PAC Chemical Database, U.S. Department of Energy
Solubility in water: Solubility in water: very good[2]
2 values
From ILO-WHO International Chemical Safety Cards (ICSCs), the most authoritative source here.
Value As written Source
– In water, 445.47 g/L at 20 °C and pH 5.23 (shake flask method) [3] Hazardous Substances Data Bank (HSDB)cites ECHA; Search for Chemicals. Sodium Sulphate (7757-82-6) Registered Substances Dossier. European Chemical Agency. Available from, as of June 15, 2017: https://echa.europa.eu/
–shown Solubility in water: very good [2] ILO-WHO International Chemical Safety Cards (ICSCs)
pKa: Reported, but no value passed the checks.
The value and why
Sodium sulphate dissociates into Na+ and SO4- ions in water. (could not be read; source [3])
Viscosity: Reported, but no value passed the checks.
The value and why
2.48 (22% solution at 20 °C) (could not be read; source [3])
Refractive index: Index of refraction: 1.464[3]

Value	As written	Source
–shown	Large Crystals; CBI; Dry Powder; Wet Solid; Dry Powder; Gas Vapor; Wet Solid; Other Solid; Dry Powder; Large Crystals; Liquid; Liquid; Dry Powder; Liquid; Liquid; Other Solid; Dry Powder; Large Crystals	[1] EPA Chemical Data Reporting (CDR)
–	WHITE HYGROSCOPIC SOLID IN VARIOUS FORMS.	[2] ILO-WHO International Chemical Safety Cards (ICSCs)

Value	As written	Source
884 °Cshown	884 °C	[2] ILO-WHO International Chemical Safety Cards (ICSCs)
888 °C	888 °C	[4] PAC Chemical Database, U.S. Department of Energy

Value	As written	Source
–shown	2.671	[3] Hazardous Substances Data Bank (HSDB)cites Larranaga, M.D., Lewis, R.J. Sr., Lewis, R.A.; Hawley's Condensed Chemical Dictionary 16th Edition. John Wiley & Sons, Inc. Hoboken, NJ 2016., p. 1254
–	Relative density (water = 1): 2.7	[2] ILO-WHO International Chemical Safety Cards (ICSCs)
–	2.671 @25 °C	[4] PAC Chemical Database, U.S. Department of Energy

Value	As written	Source
–	In water, 445.47 g/L at 20 °C and pH 5.23 (shake flask method)	[3] Hazardous Substances Data Bank (HSDB)cites ECHA; Search for Chemicals. Sodium Sulphate (7757-82-6) Registered Substances Dossier. European Chemical Agency. Available from, as of June 15, 2017: https://echa.europa.eu/
–shown	Solubility in water: very good	[2] ILO-WHO International Chemical Safety Cards (ICSCs)

Each value as its source reports it, with the source's number after it (listed under References). Where several sources report a property, the row shows the value most of them agree on, the rule the app uses; open the values to see every one.

Calculated

Heavy atoms: 7
Rings: 0
Aromatic rings: 0
Fraction sp³ carbons (Fsp3): 0
H-bond donors: 0
H-bond acceptors: 4
Rotatable bonds: 0
TPSA (Å²): 80.3 computed here · PubChem 88.6
Formal charge: 0
Complexity: 62 PubChem
Stereocenters: None
Double-bond geometry: None specified
Point group: Td of one 3D conformer with its hydrogens, by Athanor’s engine (as in the app)

Elemental analysis

Na32.37%
O45.05%
S22.58%

Isotope pattern

Each peak is a nominal mass with its abundance-weighted exact mass, as a percentage of the tallest, from IUPAC natural isotope abundances.

Computed from the structure with RDKit 2026.09 when this page was built, beside PubChem's own computed values from its record; where the two differ, both are shown.

Predicted

log P: -7.33 Crippen (Wildman and Crippen 1999)
log S (water solubility): 3.9 ESOL (Delaney 2004), log mol/L
Synthetic accessibility: 4.82 SA score, 1 easy to 10 hard (Ertl and Schuffenhauer 2009)

Drug-likeness: Lipinski’s rule of five

Molecular weight ≤ 500: 142.04
log P ≤ 5 (Crippen): -7.33
H-bond donors ≤ 5: 0
H-bond acceptors ≤ 10: 4

Passes all four rules.

Predictions, not measurements; each names its method. A measured log P, where a source reports one, is under Physical properties.

Safety

This chemical does not meet GHS hazard criteria for 96.5% (4127 of 4277) of all reports.[5]

First aid

Fresh air, rest.[2]
Rinse and then wash skin with water and soap.[2]
First rinse with plenty of water for several minutes (remove contact lenses if easily possible), then refer for medical attention.[2]
Give one or two glasses of water to drink.[2]

Storage

Keep container tightly closed in a dry and well-ventilated place. Hygroscopic. Storage class (TRGS 510): Non Combustible Solids.[3]

Incompatibilities

Incompatible materials: Strong acids, aluminum, magnesium.[3]
Violent reaction with aluminum.[3]
Sodium sulfate reacts violently with magnesium.[3]
At a temperature of 800 °C, sodium sulfate and aluminum will explode.[3]

Safety data sheets on the supplier’s page: Thermo Fisher Scientific, Protheragen, Clearsynth.

Always read the supplier’s safety data sheet before working with it.

Spectra

FTIRSpectraBase (KBr pellet)
RamanRRUFF Project · RRUFF Project · RRUFF Project · RRUFF Project · RRUFF Project · RRUFF Project

Experimental spectra held by these sources; each link opens the source's own record.

Literature

Reading PubChem, OpenAlex and GSRS…

Bioactivity

Reading ChEMBL…

References

[1]EPA Chemical Data Reporting (CDR) · Public domain (US EPA) · via PubChem · retrieved 2026-10-14
[2]ILO-WHO International Chemical Safety Cards (ICSCs) · CC BY 4.0 · via PubChem · retrieved 2026-10-14
[3]Hazardous Substances Data Bank (HSDB) · Public domain (US NLM) · via PubChem · retrieved 2026-10-14
[4]PAC Chemical Database, U.S. Department of Energy · Public domain (US DOE) · via PubChem · retrieved 2026-10-14
[5]European Chemicals Agency (ECHA) · ECHA legal notice: reuse with acknowledgement · via PubChem · retrieved 2026-10-14
[6]SpectraBase · Linked only · via PubChem · retrieved 2026-10-14
[7]RRUFF Project · Linked only · via PubChem · retrieved 2026-10-14
·Calculated values: computed by Athanor with RDKit 2026.09 from the structure.
·Literature on PubChem

Data last updated 2026-10-14.