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Sigma-Aldrich

Potassium tartrate dibasic hemihydrate

meets analytical specification of DAC, E336, 99-102% (perchloric acid titration)

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Synonym(s):
L-(+)-Tartaric acid dipotassium salt, Dipotassium tartrate hemihydrate
Linear Formula:
KOOC(CHOH)2COOK · 0.5H2O
CAS Number:
Molecular Weight:
235.28
Beilstein:
6121656
EC Number:
MDL number:
UNSPSC Code:
12352100
PubChem Substance ID:
NACRES:
NA.21

Quality Level

Assay

99-102% (perchloric acid titration)

form

solid

quality

meets analytical specification of DAC, E336

impurities

≤0.001% ammonium (NH4)
≤0.001% heavy metals (as Pb)

loss

≤4% loss on drying, 150 °C, 4 h

pH

7-9 (20 °C, 0.1%)

anion traces

chloride (Cl-): ≤500 mg/kg
oxalate (as oxalic acid): ≤100 mg/kg
sulfate (SO42-): ≤1000 mg/kg

cation traces

As: ≤3 mg/kg
Ca: ≤100 mg/kg
Cu: ≤10 mg/kg
Fe: ≤20 mg/kg
Hg: ≤1 mg/kg
Pb: ≤5 mg/kg
Zn: ≤10 mg/kg

SMILES string

O.[K+].[K+].O[C@H]([C@@H](O)C([O-])=O)C([O-])=O

InChI

1S/C4H6O6.2K.H2O/c5-1(3(7)8)2(6)4(9)10;;;/h1-2,5-6H,(H,7,8)(H,9,10);;;1H2/q;2*+1;/p-2/t1-,2-;;;/m1.../s1

InChI key

BUCMCXRUIRJPKS-QXMMYYGRSA-L

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General description

Potassium tartrate dibasic hemihydrate is the dipotassium salt of tartaric acid.

Application

Potassium tartrate dibasic hemihydrate (Potassium L-tartrate dibasic hemihydrate) may be used in the hydrothermal synthesis of 4 metal-organic coordination polymers:
  • {[Cd3(C4H4O6)3(H2O)].H2O}n
  • {Cd3(C4H3O6)2(H2O)2].5.5H2O}n
  • {[Cd2(C4H4O6)2(H2O)].3H2O}n
  • [Cd(C4H4O6)]n

Pictograms

Corrosion

Signal Word

Danger

Hazard Statements

Precautionary Statements

Hazard Classifications

Eye Dam. 1

WGK

WGK 3

Flash Point(F)

Not applicable

Flash Point(C)

Not applicable

Personal Protective Equipment

dust mask type N95 (US), Eyeshields, Gloves

Certificates of Analysis (COA)

Search for Certificates of Analysis (COA) by entering the products Lot/Batch Number. Lot and Batch Numbers can be found on a product’s label following the words ‘Lot’ or ‘Batch’.

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Synthesis and crystal structure of three new cadmium tartrates with open frameworks.
Vera-Cruz P, et al.
CrystEngComm, 14(24), 8606-8614 (2012)

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