柠檬酸钾 三元 一水合物

InChI key

PJAHUDTUZRZBKM-UHFFFAOYSA-K

InChI

1S/C6H8O7.3K.H2O/c7-3(8)1-6(13,5(11)12)2-4(9)10;;;;/h13H,1-2H2,(H,7,8)(H,9,10)(H,11,12);;;;1H2/q;3*+1;/p-3

SMILES string

O.[K+].[K+].[K+].OC(CC([O-])=O)(CC([O-])=O)C([O-])=O

assay

99-100.5% (calc with ref. to anhyd. subst.)

form

powder or crystals

quality

meets analytical specification of Ph. Eur., BP, FCC, E332

impurities

≤0.0005% heavy metals (as Pb), 4-6% water (Karl Fischer)

loss

3-6 loss on drying, 180°C

pH

7-9 (20 °C, 5%)

mp

275 °C (dec.) (lit.)

solubility

glycerol: soluble 1 gm in 2.5 ml, water: soluble 1 gm in 0.65 ml, alcohol: insoluble

anion traces

chloride (Cl^-): ≤30 mg/kg, oxalate (as oxalic acid): ≤100 mg/kg, sulfate (SO₄^2-): ≤50 mg/kg

cation traces

As: ≤1 mg/kg, Cu: ≤10 mg/kg, Fe: ≤10 mg/kg, Hg: ≤1 mg/kg, Na: ≤3000 mg/kg, Pb: ≤1 mg/kg, Zn: ≤10 mg/kg

suitability

in accordance for appearance of solution, passes test for reaction against H₂SO₄

application(s)

pharmaceutical (small molecule)

Quality Level

200