Basic information
- CAS
7790-62-7- Standard SMILES
O=S(=O)([O-])OS(=O)(=O)[O-].[K+].[K+]- InChIKey
KAQHZJVQFBJKCK-UHFFFAOYSA-L- Molecular formula
- K2O7S2
- Average molar mass
- 254.33 g/mol
- Monoisotopic mass
- 253.8359577
Names & identifiers
- Preferred name
- Potassium pyrosulfate
- IUPAC
- dipotassium;sulfonato sulfate
- English name
- Potassium pyrosulfate
- Molecular formula
- K2O7S2
- Molecular weight
- 254.32
Names & synonyms
Potassium pyrosulfate7790-62-7Dipotassium disulfateDipotassium disulphateDipotassium pyrosulfateUNII-AVJ6ZST7L6AVJ6ZST7L6Disulfuric acid, dipotassium saltPotassium sulfate (K2S2O7)Potassium disulfate (K2S2O7)Pyrosulfuric acid, dipotassium saltEINECS 232-216-8
Show more names
POTASSIUM HYDROGEN SULFATEPOTASSIUM PYROSULPHATEPOTASSIUM DISULFATEPotassium pyrosulfatPOTASSIUM DISULPHATEPotassiumPyrosulphateGrDI-POTASSIUM DISULPHATEPotassiuM anhydrosulfate
Potassium pyrosulfate (K2S2O7)EC 232-216-8Disulfuric acid, potassium salt (1:2)DTXSID10889580POTASSIUM PYROSULFATE [MI]RefChem:175589Potassium disulfate, ReagentPlusDTXCID801028833
Database identifiers
- CAS
7790-62-7- PubChem CID
- 62681
- DTXSID
DTXSID10889580- UNII
- AVJ6ZST7L6
- EC Number
- 232-216-8
- Nikkaji
- J254.775I
Properties
Computed structural properties
- Topological polar surface area
- 140 Ų
- Hydrogen bond donors
- 0
- Hydrogen bond acceptors
- 7
- Rotatable bonds
- 0
- Heavy atoms
- 11
- Formal charge
- 0
- Complexity
- 194
Experimental & physicochemical properties
Physical DescriptionColorless solid; [Merck Index] White solid; [Sigma-Aldrich MSDS]
Physicochemical properties
- Melting point
- 325 °C · 325 °C
- Density
- 2.28 g/mL · 2.28 g/mL at 25 °C (lit.)
- bulk density
- 830 kg/m3 · 830kg/m3
- storage temp.
- no restrictions.
- solubility
- 2 O: · H2O: 0.1 M at 20 °C, clear, colorless
- form
- Solid
- Specific Gravity
- 2.28 · 2.28
- color
- White
- Odor
- Odorless
- PH Range
- 1 · 1 - 2 at 25.5 g/l at 25 °C
- PH
- 0.8 · 0.8 (50g/l, H2O, 20℃)
- Water Solubility
- MAY DECOMPOSE
- Sensitive
- Hygroscopic
- Merck
- 14 · 14,7664
- Stability
- Stable. Incompatible with strong acids, strong bases.
- InChI
- 1S/2K.H2O7S2/c;;1-8(2,3)7-9(4,5)6/h;;(H,1,2,3)(H,4,5,6)/q2*+1;/p-2
- InChIKey
- KAQHZJVQFBJKCK-UHFFFAOYSA-L
- SMILES
- [K+].[K+].[O-]S(=O)(=O)OS([O-])(=O)=O
- CAS DataBase Reference
- 7790 · 7790-62-7(CAS DataBase Reference)
- FDA UNII
- 6 ZST7L6 · AVJ6ZST7L6
- EPA Substance Registry System
- Disulfuric acid, dipotassium salt (7790-62-7)
- UNSPSC Code
- 12352302 · 12352302
- NACRES
- 22 · NA.22
- Symbol(GHS)
- 5 · GHS05,GHS06
- Signal word
- Danger
- Hazard statements
- 314 · H314-H330
- Precautionary statements
- 260 · P260-P271-P280-P303+P361+P353-P304+P340+P310-P305+P351+P338
- Hazard Codes
- C
- Risk Statements
- 34 · 34
- Safety Statements
- 26 · 26-36/37/39-45
- RIDADR
- 3260 · UN 3260 8/PG 2
- WGK Germany
- 3 · 3
- TSCA
- TSCA listed
- HS Code
- 2833 · 2833 29 80
- HazardClass
- 8 · 8
- PackingGroup
- II
- Storage Class
- 6.1 B · 6.1B - Non-combustible acute toxic Cat. 1 and 2very toxic hazardous materials
- Hazard Classifications
- 3 InhalationEye · Acute Tox. 3 InhalationEye Dam. 1Skin Corr. 1A
- REACH Registrations
- Active
Safety & regulation
GHS classification
GHS Classification
This chemical does not meet GHS hazard criteria for 1.3% (2 of 149) of reports.
Danger
H314 (97.3%): Causes severe skin burns and eye damage [Danger Skin corrosion/irritation]；H318 (38.9%): Causes serious eye damage [Danger Serious eye damage/eye irritation]；H331 (36.9%): Toxic if inhaled [Danger Acute toxicity, inhalation]
P260, P261, P264, P264+P265, P271, P280, P301+P330+P331, P302+P361+P354, P304+P340, P305+P354+P338, P316, P317, P321, P363, P403+P233, P405, and P501 (click each P-code to see the statement)
Aggregated GHS information provided per 149 reports by companies from 8 notifications to the ECHA C&L Inventory. Each notification may be associated with multiple companies.；Reported as not meeting GHS hazard criteria per 2 of 149 reports by companies.；There are 7 notifications provided by 147 of 149 reports by companies with hazard statement code(s).；Information may vary between notifications depending on impurities, additives, and other factors. The percentage value in parenthesis indicates the notified classification ratio from companies that provide hazard codes. Only hazard codes with percentage values above 10% are shown. For more detailed information, please visit ECHA C&L website.
Hazard information
Regulatory Information
Chemical: Disulfuric acid, dipotassium salt
Status: Active Update: 04-04-2018 https://echa.europa.eu/registration-dossier/-/registered-dossier/11493
Potassium pyrosulphate: Does not have an individual approval but may be used under an appropriate group standard
Hazards SummaryCauses burns; Inhalation may cause corrosive injuries to upper respiratory tract and lungs; [Sigma-Aldrich MSDS] See Potassium sulfate.
Hazard Classes and CategoriesSkin Corr. 1A (97.3%)；Eye Dam. 1 (38.9%)；Acute Tox. 3 (36.9%)
Safety & protection
Protective Action Criteria (PAC)
0.20 [mg/m3]
8.7 [mg/m3]
160 [mg/m3]
Toxicology
Adverse EffectsDermatotoxin - Skin burns.；Toxic Pneumonitis - Inflammation of the lungs induced by inhalation of metal fumes or toxic gases and vapors.
Regulatory information
Regulatory Information
Chemical: Disulfuric acid, dipotassium salt
Status: Active Update: 04-04-2018 https://echa.europa.eu/registration-dossier/-/registered-dossier/11493
Potassium pyrosulphate: Does not have an individual approval but may be used under an appropriate group standard
Safety data
- wgk
- 3
- tsca
- TSCA listed
- ridadr
- UN 3260 8/PG 2
- hs_code
- 2833 29 80
- risk_code
- 34
- Signal word
- Danger
- Symbol(GHS)
- GHS05,GHS06
- hazard_code
- C
- safety_code
- 26-36/37/39-45
- hazard_class
- 8
- Storage Class
- 6.1B - Non-combustible acute toxic Cat. 1 and 2very toxic hazardous materials
- packing_group
- II
- Hazard statements
- H314-H330
- REACH Registrations
- Active
- Hazard Classifications
- Acute Tox. 3 InhalationEye Dam. 1Skin Corr. 1A
- Precautionary statements
- P260-P271-P280-P303+P361+P353-P304+P340+P310-P305+P351+P338
Chemistry & industry
Uses & manufacturing
Household ProductsInformation on 2 consumer products that contain Dipotassium disulfate in the following categories is provided:；• Commercial / Institutional
General Manufacturing InformationDisulfuric acid, potassium salt (1:2): ACTIVE
Applications
UsesPotassium disulfite supported on silica may be used for the synthesis of ethyl pyruvate.
UsesPotassium disulfate (K2S2O7) can be used: As a salt catalyst for the conversion of hemicellulose into reducing sugars such as xylose and galactose by mechanocatalysis . In the preparation of diacylbenzenes via Pd-catalyzed decarboxylative acylation of aromatic ketones with oxocarboxylic acids. As an oxidant for the preparation of monosubstituted triazoles from aryl azides and propargyl alcohol using Ag2O as a catalyst.
UsesAcid flux in analysis, laboratory reagent.
General DescriptionPotassium disulfite (Potassium pyrosulfate) has been synthesized from potassium hydrogen sulfate, via melting.
Preparation methods
PreparationPotassium pyrosulphate is obtained by heating potassium hydrogen sulphate to its melting point.
Upstream & downstream products
Upstream raw materials
Downstream products
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Related reactions
3 records
Compound notes
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