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Sulfates and sulfur salts

Potassium dithionite

Also known as dipotassium dithionite, Potassium hydrosulfite, Potassium dithionite (k2s2o4)

CAS 14293-73-3Formula K2O4S2Molar mass 206.33 g/mol
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Potassium dithionite chemical structure, K2O4S2, CAS 14293-73-3
2D chemical structure

Key facts

What buyers check first

All properties
Appearance
Light yellow colored powdered or flaked solid
Solubility
White crystalline powder, molecular weight = 120.17, MP = 190 °C (dec), solubility = 49…
HS code
283190
Category
Sulfates and sulfur salts
UN number
UN 1929
Illustrative photo, off-white crystalline powder in an HDPE jar on a laboratory bench
Typical packagingIllustrative packaging image, not the actual product

What is Potassium dithionite?

Plain description, key identifiers and synonyms

Potassium dithionite appears as a light yellow colored powdered or flaked solid. Used to make dyes and other chemicals.

Identifiers

Registry numbers, names and line notations, tap to copy

CAS number
14293-73-3 CAS number cross-checked
Molecular formula
K2O4S2
UNII
0B8I49QLG5
InChIKey
HEZHYQDYRPUXNJ-UHFFFAOYSA-L
InChI
InChI=1S/2K.H2O4S2/c;;1-5(2)6(3)4/h;;(H,1,2)(H,3,4)/q2*+1;/p-2
SMILES (canonical and isomeric)
[O-]S(=O)S(=O)[O-].[K+].[K+]

Synonyms

  • dipotassium dithionite
  • Potassium hydrosulfite
  • Potassium dithionite (k2s2o4)
  • Potassium dithionite or potassium hydrosulfite
  • Dithionous acid, potassium salt (1:2)
  • Potassium hydrosulphite
  • Dithionous acid, dipotassium salt
  • Potassium dithionite or potassium hydrosulfite [UN1929] [Spontaneously combustible]

Physical and chemical properties

Measured values and descriptors computed from the structure

Physical and chemical properties

Measured values, check the supplier specification for your grade

Appearance
Light yellow colored powdered or flaked solidexp.
Solubility
White crystalline powder, molecular weight = 120.17, MP = 190 °C (dec), solubility = 49 g/100 g water at 20 °C, insoluble in ethanol /Potassium hydrogen sulfite/exp.

Values vary by grade. Ask suppliers for the COA or TDS of the batch you buy.

Computed descriptors

Calculated from the structure, useful for screening and formulation

Molecular weight
206.33 g/molcalc.
Exact mass
205.8512 Dacalc.
LogP (octanol/water)
-7.33calc.
Topological polar surface area
80.26 Ųcalc.
Hydrogen bond donors
0calc.
Hydrogen bond acceptors
4calc.
Rotatable bonds
1calc.
Heavy atoms
8calc.
Rings
0calc.
Aromatic rings
0calc.
Fraction sp3 carbons
0calc.
Formal charge
0calc.
Stereocentres
2calc.
Components
3calc.

Calculated for screening. Confirm critical figures with the supplier.

Safety and hazards

GHS classification summary, not a safety data sheet

GHS classification
Hazard pictograms
UN number
UN 1929
Transport hazard class
4.2

GHS classification summary, not a safety data sheet (SDS). Classifications can differ by supplier, grade and concentration. Always check the supplier's SDS.

Full safety data and first aid

Potassium dithionite suppliers

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Potassium dithionite price

Indicative price range per kg from live supplier offers

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Uses and applications

What the substance is used for, by industry and function

Used to make dyes and other chemicals.

Regulatory status

Inventories, regulations and trade controls that list this substance

No regulatory list memberships are recorded for this substance yet. Always check the rules of the importing and exporting country before trade.

HS code and trade data

Customs classification and reported world trade statistics

Global trade

World import and export statistics for the HS code Potassium dithionite is traded under.

HS 2831.90Indicative HS code

Dithionites and sulphoxylates, other

World exports in 2024
$19.2M
−6.4% vs 2023, imports $18.5M
2019 to 2024
Top exporters
  1. China71.8%
  2. India * partner reported20.8%
  3. Turkey3.0%
Top importers
  1. Pakistan57.5%
  2. China9.4%
  3. Turkey7.0%

* Partner reported figures, a lower bound.

Reported customs values in USD, not prices.Full trade data

The HS code shown for Potassium dithionite is indicative (it was assigned by structure rules). Confirm the classification with your customs broker before shipping.

Frequently asked questions

Quick answers about Potassium dithionite, based on the data on this page

What is Potassium dithionite?

Potassium dithionite appears as a light yellow colored powdered or flaked solid. Used to make dyes and other chemicals.

What is the CAS number of Potassium dithionite?

The CAS registry number of Potassium dithionite is 14293-73-3.

What is the molecular formula and weight of Potassium dithionite?

The molecular formula of Potassium dithionite is K2O4S2 and its molar mass is 206.33 g/mol.

What is Potassium dithionite used for?

Used to make dyes and other chemicals.

Is Potassium dithionite hazardous?

No GHS hazard classification for Potassium dithionite is recorded on CompoundList yet. That does not prove it is safe. Always read the supplier safety data sheet.

What is the HS code of Potassium dithionite?

Potassium dithionite is usually classified under HS code 283190 (Dithionites and sulphoxylates, other). This is indicative, confirm it with your customs broker before shipping.

Where can I buy Potassium dithionite?

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What is the price of Potassium dithionite?

Suppliers quote Potassium dithionite on request because prices depend on grade, purity, quantity and destination. A free request on CompoundList gets you several quotes to compare.

Guides for buyers

Practical guides that help when you source, ship or handle Potassium dithionite

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Data last updated 7 Oct 2026. Details may have changed, please confirm them with the supplier. Report an error on this page
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