Potassium Hydrogen Phthalate Volumetric Standard 80g Merck

About Potassium Hydrogen Phthalate Volumetric Standard 80g Merck

Brand: Merck
Grade: Certipur Volumetric Standard
Pack Size: 80 g

• Chemical Name: Potassium Hydrogen Phthalate (KHP)

• Molecular Formula: CHKO

• Molecular Weight: 204.22 g/mol

• CAS No.: 877-24-7

• EC No.: 212-889-4

• Appearance: White crystalline powder / crystals

• Solubility: Soluble in water (~80 g/L at 20 C)

• • pH (50 g/L solution): approx. 4.0 at 20 C

  • Melting Point / Decomposition: ~295300 C

  3. Analytical Specifications

  
  

  Parameter	Specification
  Assay (Acidimetric)	99.95 %
  Identity	Passes test
  Insoluble Matter	0.005 %
  Loss on Drying (105 C)	0.2 %
  Chloride (Cl)	0.005 %
  Sulfate (SO)	0.01 %
  Iron (Fe)	0.0005 %
  Heavy Metals (as Pb)	0.0005 %

  4. Quality & Traceability

  • Volumetric standard for alkalimetry

  • Traceable to NIST SRM

  • Suitable for analytical laboratories & calibration work

  5. Applications

  • Standardization of NaOH and other alkaline solutions

  • Acidbase titration reference material

  • Used in analytical chemistry, QC labs, and research labs

  6. Storage Conditions

  • Store at 1525 C

  • Keep tightly closed in dry conditions

  Short quotation description (commonly used):
  Potassium Hydrogen Phthalate (KHP), Certipur Volumetric Standard, traceable to NIST SRM, assay 99.95 %, Merck Cat. No. 1.02400.0080, pack size 80 g.