Synonyms

Dibasic potassium tartrate

Definition

Chemical name

Dipotassium salt of L-2,3-dihydroxybutanedioic acid

Dipotassium salt with half a molecule of water of L-(+)-tartaric acid

Einecs

213-067-8

Chemical formula

C₄H₄O₆K₂·1/2H₂O

Molecular weight

235,2

Assay

Content not less than 99 % on the anhydrous basis

Description

White crystalline or granulated powder

Identification

Purity

pH of a 1 % aqueous solution

Between 7,0 and 9,0

Loss on drying

Not more than 4,0 % determined by drying at 150 ^oC for four hours

Oxalates

Not more than 100 mg/kg expressed as oxalic acid, after drying

Arsenic

Not more than 3 mg/kg

Lead

Not more than 5 mg/kg

Mercury

Not more than 1 mg/kg

Heavy metals (as Pb)

Not more than 10 mg/kg