30435

di-Sodium hydrogen phosphate dihydrate

puriss. p.a., reag. Ph. Eur., 98.5-101.0% (calc. to the dried substance)

• Synonym(s): sec-Sodium phosphate, Disodium hydrogen phosphate dihydrate, Disodium phosphate, Sodium phosphate dibasic dihydrate
• Linear Formula: Na₂HPO₄ · 2H₂O
• CAS Number: 10028-24-7
• Molecular Weight: 177.99
• EC Number: 231-448-7
• MDL number: MFCD00149182
• UNSPSC Code: 12352302
• PubChem Substance ID: 329753513
• NACRES: NA.21

Properties

• Agency: USP/NF; reag. Ph. Eur.
• grade: puriss. p.a.
• Assay: 98.5-101.0% (calc. to the dried substance)
• form: crystals
• impurities: reducing impurities, complies; ≤0.0005% heavy metals (as Pb); ≤0.001% total nitrogen (N); ≤0.5% NaH₂PO₄ (calc. to dried subst.)
• loss: 19.5-21.0% loss on drying, 130 °C
• pH: 9.0-9.2 (20 °C, 5%)
• anion traces: chloride (Cl^-): ≤10 mg/kg; sulfate (SO₄^2-): ≤50 mg/kg
• cation traces: As: ≤0.5 mg/kg; Fe: ≤5 mg/kg; K: ≤50 mg/kg
• suitability: in accordance for appearance of solution
• SMILES string: O.O.[Na+].[Na+].OP([O-])([O-])=O
• InChI: 1S/2Na.H3O4P.2H2O/c;;1-5(2,3)4;;/h;;(H3,1,2,3,4);2*1H2/q2*+1;;;/p-2
• InChI key: KDQPSPMLNJTZAL-UHFFFAOYSA-L

Description

General description

Sodium phosphate dibasic dihydrate is a highly hygroscopic and water-soluble compound. It is used in water softeners, cleaners also as buffers in particular formulations.

Application

Sodium phosphate dibasic dihydrate is used:

• In the synthesis of BiOCl/BiPO₄ composites from bismuth nitrate pentahydrate and potassium chloride by the microwave-assisted hydrothermal method.
• To prepare sodium phosphate buffer solution.
• As a phosphorus source in the synthesis of Mg-doped hydroxyapatite nanoplates.

Safety Information

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