# Potassium pyrophosphate

CAS: 7320-34-5
PubChem CID: 23740
InChIKey: RYCLIXPGLDDLTM-UHFFFAOYSA-J
Wikidata: Q2575439
Molecular formula: K₄O₇P₂
Molar mass: 330.34 g/mol
IUPAC: tetrapotassium;phosphonato phosphate
SMILES: [O-]P(=O)([O-])OP(=O)([O-])[O-].[K+].[K+].[K+].[K+]
InChI: InChI=1S/4K.H4O7P2/c;;;;1-8(2,3)7-9(4,5)6/h;;;;(H2,1,2,3)(H2,4,5,6)/q4*+1;/p-4
PSA: 136 A^2
Hydrogen bond donors: 0
Hydrogen bond acceptors: 7
Rotatable bonds: 0
Heavy atoms: 13
3D structure: 13 atoms, 8 bonds

## About the compound

Potassium pyrophosphate is a chemical compound registered under CAS number 7320-34-5. Molecular formula: K₄O₇P₂. Molar mass: 330.34 g/mol. The full systematic IUPAC name is: tetrapotassium;phosphonato phosphate. The molecule contains 13 atoms connected by 8 chemical bonds. 
Chemical data comes from the PubChem (NIH), ChEMBL (EBI) and NIST WebBook databases. GHS statement translations comply with the CLP Regulation (EC 1272/2008). Interactive 3D model and 2D skeleton available at: https://molgod.org/molecule/7320-34-5/


## Synonyms

  - Potassium pyrophosphate
  - 7320-34-5
  - Potassium diphosphate
  - TKPP
  - TETRAPOTASSIUM PYROPHOSPHATE
  - Diphosphoric acid, tetrapotassium salt
  - Tetrapotassium diphosphorate
  - Pyrophosphoric acid, tetrapotassium salt
  - B9W4019H5G
  - RefChem:897424
  - DTXCID1016446
  - 230-785-7

## Data sources

  - PubChem CID 23740: https://pubchem.ncbi.nlm.nih.gov/compound/23740
  - Wikidata: https://www.wikidata.org/wiki/Q2575439
  - NIST WebBook: https://webbook.nist.gov/cgi/cbook.cgi?ID=7320-34-5
  - ChEMBL: https://www.ebi.ac.uk/chembl/g/#search_results/all/query=7320-34-5

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Last updated: 2026-10-17
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