71650

Sodium phosphate dibasic dodecahydrate

puriss. p.a., crystallized, ≥99.0% (T)

• Synonym(s): sec-Sodium phosphate, Disodium hydrogen phosphate dodecahydrate, Disodium phosphate, di-Sodium hydrogen phosphate dodecahydrate
• Linear Formula: Na₂HPO₄ · 12H₂O
• CAS Number: 10039-32-4
• Molecular Weight: 358.14
• EC Number: 231-448-7
• MDL number: MFCD00149181
• UNSPSC Code: 12161700
• PubChem Substance ID: 329763400
• NACRES: NA.21

Properties

• grade: puriss. p.a.
• Assay: ≥99.0% (T)
• form: crystals
• quality: crystallized
• pH: 9.0-9.3 (25 °C, 50 mg/mL in H₂O)
• solubility: water: soluble 35.8 g/L at 20 °C
• anion traces: chloride (Cl^-): ≤5 mg/kg; fluoride (F^-): ≤5 mg/kg; sulfate (SO₄^2-): ≤50 mg/kg
• cation traces: As: ≤0.5 mg/kg; Ca: ≤10 mg/kg; Cd: ≤5 mg/kg; Co: ≤5 mg/kg; Cr: ≤5 mg/kg; Cu: ≤5 mg/kg; Fe: ≤5 mg/kg; K: ≤50 mg/kg; Mg: ≤5 mg/kg; Mn: ≤5 mg/kg; Ni: ≤5 mg/kg; Pb: ≤5 mg/kg; Zn: ≤5 mg/kg
• SMILES string: O.O.O.O.O.O.O.O.O.O.O.O.[Na+].[Na+].OP([O-])([O-])=O
• InChI: 1S/2Na.H3O4P.12H2O/c;;1-5(2,3)4;;;;;;;;;;;;/h;;(H3,1,2,3,4);12*1H2/q2*+1;;;;;;;;;;;;;/p-2
• InChI key: DGLRDKLJZLEJCY-UHFFFAOYSA-L

Description

General description

Sodium phosphate is a colorless crystalline sodium salt. It is widely used as a buffer in molecular biology, biochemistry, and chromatographic studies. It exists in three forms: monobasic (NaH₂PO₄), dibasic (Na₂HPO₄), and tribasic (Na₃PO₄). Monobasic and dibasic forms in varying ratios are commonly used to compose the neutral sodium phosphate buffer solution.

Application

Sodium phosphate dibasic dodecahydrate may be used to prepare the 0.1M phosphate buffer having pH 7.4.

Safety Information

• Storage Class Code: 13 - Non Combustible Solids
• WGK: WGK 1
• Flash Point(F): Not applicable
• Flash Point(C): Not applicable