Sodium ammonium tartrate

Sodium ammonium tartrate
Names
	Other names Ammonium Rochelle salt
Identifiers
CAS Number	16828-01-6;
3D model (JSmol)	Interactive image;
ChemSpider	10667488;
ECHA InfoCard	100.037.121
EC Number	240-850-1;
PubChem CID	21915779;
CompTox Dashboard (EPA)	DTXSID90937472 ;
	InChI InChI=1S/C4H6O6.H3N.Na/c5-1(3(7)8)2(6)4(9)10;;/h1-2,5-6H,(H,7,8)(H,9,10);1H3;/q;;+1/p-1 Key: QGKIJYBOYMJGHT-UHFFFAOYSA-M;
	SMILES C(C(C(=O)[O-])O)(C(=O)[O-])O.[NH4+].[Na+];
Properties
Chemical formula	C4H8NNaO6
Molar mass	189.099 g·mol−1
Appearance	white solid
	Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa). Infobox references

Sodium ammonium tartrate (NAT) is an organic compound with the formula Na(NH₄)[O₂CCH(OH)CH(OH)CO₂]. The salt is derived from tartaric acid by neutralizing with ammonia and with sodium hydroxide. Louis Pasteur obtained enantiopure crystals of the tetrahydrate of NAT, via the process of spontaneous resolution. His discovery led to increased study of optical activity, which eventually was shown to have broad implications. Many modification of this salt have been investigated by X-ray crystallography, including the racemate, which crystallizes as the monohydrate.

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