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Chemical substance record

Potassium metaphosphate

7790-53-6K.O3P118.069 g/mol
Salt and Compound WithChEBI source record

A potassium salt of metaphosphoric acid. — ChEBI

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Identity & molecular properties

Source-linked values
CAS number7790-53-6ChEBI ↗
Molecular formulaK.O3PChEBI ↗
Molar mass118.069 g/molChEBI ↗
Monoisotopic mass117.92221 DaChEBI ↗
Formal charge0ChEBI ↗
ChEBI identifierCHEBI:148438ChEBI ↗

Cross-source molecular data

PubChem
Molar mass118.070 g/molPubChem ↗
Exact mass117.92221234 DaPubChem ↗

PubChem computed values are shown separately from the ChEBI record. An exact InChIKey match was used to connect the records. Molecular descriptors do not describe a supplied product’s purity, particle size or performance.

Names & structural identifiers

Copy any identifier
potassium metaphosphate
potassium oxophosphinate
OQZCJRJRGMMSGK-UHFFFAOYSA-M
O=P(=O)[O-].[K+]
InChI=1S/K.HO3P/c;1-4(2)3/h;(H,1,2,3)/q+1;/p-1

Names & synonyms

potassium oxophosphinate

Names are supplied by ChEBI. Trade names and related synonyms may describe a broader product context.

Classification & relationships

ChEBI ontology

Roles recorded in ChEBI

fertilizerbufferfood emulsifiersequestrantraising agent

Database role annotations describe reported biological or chemical roles; they are not product approvals or recommendations for use.

Mass ↔ amount of substance

Calculated from sourced mass
Equivalent amount
0.00846962 mol

Uses 118.069 g/mol from ChEBI. Assumes the substance described by this record; no purity or concentration correction is applied.

Elemental composition

Theoretical mass fractions
O
Oxygen · 3 atoms
40.65%
K
Potassium · 1 atom
33.11%
P
Phosphorus · 1 atom
26.23%

Calculated theoretical mass fractions from the reported formula and PubChem periodic-table atomic masses. These are not assay or purity results.

Research & patent references

Selected source associations

Sources & record history

Checked 27 Sep 2026
EMBL-EBI ChEBI · CHEBI:148438

Release 255, 9 September 2026. ChEBI three-star (manually annotated) source entry. View original record ↗ · CC BY 4.0

NCBI PubChem · CID 16132261 · retrieved 2026-09-27

PubCAS formats source data, connects references and computes explicitly labelled conversions. CAS cross-references are supplied by ChEBI; they do not constitute CAS verification or endorsement.