Sodium citrate tribasic dihydrate

InChI key

NLJMYIDDQXHKNR-UHFFFAOYSA-K

InChI

1S/C6H8O7.3Na.2H2O/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);;;;2*1H2/q;3*+1;;/p-3

SMILES string

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

grade

puriss.

assay

99-100.5% (calc. to the dried substance)

quality

meets analytical specification of Ph. Eur., BP, USP, FCC, E331

impurities

Residual solvent, in accordance, acidity or alkalinity, complies, ≤0.0005% heavy metals (as Pb), ≤0.04% free alkali (as NaOH), ≤0.06% free acid (as C₆H₈O₇), 11.0-13.0 water (Karl Fischer)

loss

11-13% loss on drying, 180 °C, 18 h

pH

7.5-9.0 (20 °C, 5%)

mp

>300 °C (lit.)

anion traces

chloride (Cl^-): ≤30 mg/kg, oxalate (as oxalic acid): ≤100 mg/kg, sulfate (SO₄^2-): ≤50 mg/kg, tartrate (C₄H₄O₆^2-): in accordance

cation traces

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

suitability

alkaline for reaction against litmus, complies for appearance of solution, complies for reaction against H₂SO₄

Quality Level

200