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

ACS reagent, puriss. p.a.

agency

USP/NF, reag. ISO, reag. Ph. Eur.

assay

≥99.5%

impurities

≤0.001% total nitrogen (N), 11-13% water (Karl Fischer)

pH

7.5-9.0 (20 °C, 5%)

mp

>300 °C (lit.)

anion traces

chloride (Cl^-): ≤10 mg/kg, oxalate (C₂O₄^2-): ≤200 mg/kg, phosphate (PO₄^3-): ≤20 mg/kg, sulfate (SO₄^2-): ≤10 mg/kg

cation traces

Ca: ≤50 mg/kg, Cu: ≤5 mg/kg, Fe: ≤5 mg/kg, Pb: ≤2 mg/kg, Zn: ≤5 mg/kg

suitability

complies for reaction against H₂SO₄