Chemical Identity
One search box, three views of a substance: its identity (CAS, IUPAC name, formula, MW), its registered synonyms, and reagent substitutes, live via PubChem through a same-origin proxy, with a built-in dataset as fallback.
How to use this tool
Type what you know, a name, a CAS number, or a formula, and switch tabs to read the same substance three ways. Identify gives the standard identity card; Synonyms lists its other names; Substitutes suggests reagent alternatives and shows GHS hazards. One lookup feeds all three.
What to enter
- A chemical name: formal or everyday: sodium hydroxide, caustic soda, muriatic acid.
- A CAS number: in the form 7732-18-5 (Identify tab).
- A molecular formula: NaOH, H₂O.
Press Look up or hit Enter. The Substitutes tab also accepts a role word, acid, base, oxidiser, drying agent, solvent.
Worked example
Searching muriatic acid returns Hydrochloric acid: CAS 7647-01-0, formula HCl, with its synonyms and acid substitutes a tab away.
Methodology
Identify matches a local index on name, IUPAC name, CAS, formula and synonyms (case-insensitive, substring). When a term isn't local, it queries the same-origin proxy against PubChem, the NCI/CADD resolver, CAS Common Chemistry (when keyed) and enriches with EPA CompTox.
Synonyms resolves the term to its PubChem / CAS Common Chemistry record and lists registered synonyms. Substitutes reads identity and GHS hazards live and cross-references curated reagent-role sets; you can also search by the role a reagent plays.
Sources
- CAS Registry, Chemical Abstracts Service; CAS Common Chemistry (via same-origin proxy, when keyed).
- PubChem PUG REST API; NCI/CADD Chemical Identifier Resolver; EPA CompTox (via same-origin proxy).
- Substitute sets curated from general synthetic practice; Vogel's Practical Organic Chemistry.