795496

Potassium phosphate dibasic

anhydrous, free-flowing, Redi-Dri^™, ACS reagent, ≥98%

• Synonym(s): Dipotassium hydrogenphosphate, Dipotassium phosphate, sec.-Potassium phosphate
• Linear Formula: K₂HPO₄
• CAS Number: 7758-11-4
• Molecular Weight: 174.18
• EC Number: 231-834-5
• MDL number: MFCD00011383
• UNSPSC Code: 12352302
• PubChem Substance ID: 329768488
• NACRES: NA.21

Properties

• grade: ACS reagent; anhydrous
• Quality Level: 200
• agency: suitable for SM 5210
• product line: Redi-Dri^™
• assay: ≥98%
• form: powder
• quality: free-flowing
• impurities: ≤0.001% Nitrogen compounds (as N); ≤0.01% Insoluble matter
• loss: ≤1.0% loss on drying, 105°C
• pH: 8.5-9.6 (25 °C, 5% in solution)
• pKa (25 °C): (1) 2.15, (2) 6.82, (3) 12.38 (phosphoric acid)
• anion traces: chloride (Cl^-): ≤0.003%; sulfate (SO₄^2-): ≤0.005%
• cation traces: Fe: ≤0.001%; Na: ≤0.05%; heavy metals: ≤5 ppm (by ICP-OES)
• SMILES string: [K+].[K+].OP([O-])([O-])=O
• InChI: 1S/2K.H3O4P/c;;1-5(2,3)4/h;;(H3,1,2,3,4)/q2*+1;/p-2
• InChI key: ZPWVASYFFYYZEW-UHFFFAOYSA-L

Description

General description

Potassium phosphate dibasic is a useful biological buffer having a pH in the range of 8.5–9.6. Potassium phosphate is present in various forms: monobasic (KH₂PO₄), dibasic (KH₂PO₄), and tribasic (K₃PO₄). Potassium phosphate buffers are widely employed in equilibrium dialysis, high performance liquid chromatography (HPLC) and affinity capillary electrophoresis studies.

Application

Potassium phosphate dibasic has been used in the preparation of MMG (maltose, methyl green) medium, phosphate buffered saline and hypotonic solution.

Features and Benefits

• Increased efficiency – Eliminate time and effort of loosening hardened powders
• Safety – Avoid risks of using tools of force to break up clumps
• Economy – Faster preparation and solvation increase productivity and reduce costs
• Assured quality – Excellent, expert-tested quality with no anti-caking agents
• Flexible volumes – Available from research amounts to scale-up quantities

Legal Information

Redi-Dri is a trademark of Sigma-Aldrich Co. LLC

Safety Information

• Storage Class: 11 - Combustible Solids
• wgk_germany: WGK 1
• flash_point_f: Not applicable
• flash_point_c: Not applicable