Na2SO3 x 5 H2O

Ontology mapping

Primary identifier: CHEBI:86477
Ontology label: sodium sulfite
kg-microbe node: CHEBI:86477

Synonyms (3)

Synonym	Type	Source
Anhydrous sodium sulfite	EXACT_SYNONYM	kg_microbe
Sodium sulfite anhydrous	EXACT_SYNONYM	kg_microbe
disodium sulfite	EXACT_SYNONYM	chebi_synonym_review

Chemical properties

Data source: PubChem (via CHEBI:86477)
Retrieval date: 2026-04-09T00:32:50.689620+00:00
Molecular formula: 2Na.O3S.5H2O
Inchi: InChI=1S/2Na.H2O3S/c;;1-4(2)3/h;;(H2,1,2,3)/q2*+1;/p-2
Smiles: O=S([O-])[O-].[Na+].[Na+]

Evidence (2)

DATABASE_MATCH via CultureMech

Imported from CultureMech pipeline, quality=DIRECT_MATCH

DATABASE_MATCH via MIM curation (#321)

molecular_formula '2Na.O3S' -> '2Na.O3S.5H2O'. The recorded value described the anhydrous salt while the label names a hydrate, understating the mass by 18 g/mol per water. Corrected because the label states 5 water(s) of hydration, and the recorded formula was byte-identical to the anhydrous parent CHEBI:86477's ChEBI formula ('2Na.O3S') — the mark of a value inherited from the parent rather than measured for this record. Water appended in ChEBI's own dot-separated notation.

Occurrence statistics

Total occurrences: 26
Distinct media: 26

Curation history

Timestamp	Curator	Action	New status	Changes
2026-03-09T06:54:18.022301+00:00	import_from_culturemech	IMPORTED	MAPPED	Initial import from CultureMech pipeline
2026-04-09T00:32:50.689620+00:00	enrich_mim_cas_rn_batch	CAS_RN_ADDED	MAPPED	Added CAS-RN 7757-83-7 from PubChem (via CHEBI:86477)
2026-04-18T00:00:00+00:00	cbclaw_kg_microbe_sweep LLM	ADDED_SYNONYMS	MAPPED	Added 2 synonyms from kg-microbe P4.4 enrichment: Anhydrous sodium sulfite, Sodium sulfite anhydrous
2026-05-01T07:35:35.292074+00:00	auto_classify_ingredient_type	AUTO_CLASSIFY_INGREDIENT_TYPE		set ingredient_type=SINGLE_INGREDIENT (CHEBI primary)
2026-05-01T08:08:31.366134+00:00	auto_classify_ingredient_type	AUTO_BACKFILL_CHEBI_CHEMISTRY		molecular_formula=2Na.O3S; inchi=InChI=1S/2Na.H2O3S/c;;1-4(2)3/h;;(H2,1,2,3)/q2*+1;; smiles=O=S([O-])[O-].[Na+].[Na+]
2026-05-02T03:12:17.115173+00:00	auto_classify_ingredient_type	AUTO_CLASSIFY_INGREDIENT_TYPE		set ingredient_type=SINGLE_INGREDIENT (chemical structure populated (molecular_formula))
2026-06-09T05:23:46.808207+00:00	correct_stale_ontology_labels.py	CORRECTED		ontology_label 'Na2SO3 x 5 H2O' -> 'sodium sulfite': synced to canonical CHEBI label (preferred_term 'Na2SO3 x 5 H2O' unchanged).
2026-08-10T00:00:00+00:00	regrade_synonym_matches	REGRADED_EXACT_TO_SYNONYM		mapping_quality EXACT_MATCH -> SYNONYM_MATCH (#317). The record's label does not equal the term's primary label 'sodium sulfite'; it matches the ChEBI synonym 'Sodium sulfite anhydrous' on CHEBI:86477. The schema defines EXACT_MATCH as a direct match to the term and SYNONYM_MATCH as a match to a known synonym, so the recorded grade overstated. ontology_id is unchanged — the term is correct. The SSSOM predicate is unaffected (both grades emit skos:exactMatch).
2026-08-13T00:00:00+00:00	add_water_of_hydration	ADDED_WATER_OF_HYDRATION		molecular_formula '2Na.O3S' -> '2Na.O3S.5H2O' (#321); the label states 5 water(s) of hydration, and the recorded formula was byte-identical to the anhydrous parent CHEBI:86477's ChEBI formula ('2Na.O3S') — the mark of a value inherited from the parent rather than measured for this record. Water appended in ChEBI's own dot-separated notation.
2026-08-27T03:16:39.519507+00:00	refresh_occurrence_statistics	CORRECTED		occurrence_statistics 1/1 -> 26/26 (media_count/total_occurrences), derived from distinct CultureMech recipe ids in the #337 occurrence table. The prior values came from the importer retired in #453, whose media_count counted a list truncated to 50 examples (#449). [source=ingredient_occurrences.tsv culturemech_rev=15a4da5c08 rows=194137 distinct_recipes=15257]
2026-08-29T04:18:06.717988+00:00	hydrate_family_cas	CORRECTED		cas_rn 7757-83-7 REMOVED, not replaced: it is the anhydrous Na2SO3 CAS, and this record names a hydrate -- a different substance with a different formula weight. ChEBI has no term for this hydration state, so no authoritative value can be substituted. The grounding is separately wrong (#321); this corrects only the CAS (#334).