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Sodium tartrate

Sodium tartrate

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Name:Sodium tartrate
Synonyms:Disodium tartrate; [R-(R*,R*)]-2,3-Dihydroxybutanedioic acid disodium salt 
Molecular Formula:C4H4Na2O6
Molecular Weight:194.05
CAS Registry Number:868-18-8
EINECS:212-773-3
 
Because its crystal structure captures a very precise amount of water, it is also a common primary standard for Karl Fischer titration, a common technique to assay water content.