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CAS:877-24-7
Molecular Formula:C8H5KO4
Molecular Weight:204.22
EINECS:212-889-4
Synonyms:POTASSIUM ACID PHTHALATE BUFFER GRADE; potassium hydrogen phthalate, primary standard
What is Potassium hydrogen phthalate CAS 877-24-7？
Potassium hydrogen phthalate is an organic aromatic acid salt of phthalic acid, which is a colorless monoclinic crystal or white crystalline powder. It is stable in air, soluble in water, and slightly soluble in alcohol. Dissolve in approximately 12 parts cold water, 3 parts boiling water, and slightly soluble in ethanol. The solution is acidic. The pH of a 0.05mol/L aqueous solution at 25 ℃ is 4.005.
Specification
| Item | Specification |
| Boiling point | 98.5-99.5 ;°C/740 ;mmHg(lit .) |
| Density | 1.006 g/mL at 20 °C |
| Melting point | 295-300 °C (dec.) (lit.) |
| PH | 4.00-4.02 (25.0℃±0.2℃, 0.05M) |
| resistivity | H2O：100 mg/mL |
| Storage conditions | Store at +5°C to +30°C. |
Application
Potassium hydrogen phthalate is commonly used for the calibration of sodium hydroxide standard solutions due to its ease of obtaining pure products through recrystallization, absence of crystallization water, non hygroscopicity, easy storage, and high equivalence; It can also be used for calibration of acetic acid solution with perchloric acid (using methyl violet as an indicator).
Packaging
Usually packed in 25kg/drum,and also can be do customized package.
Synonyms
POTASSIUM ACID PHTHALATE BUFFER GRADE; potassium hydrogen phthalate, primary standard, acs;POTASSIUMBIPHTHALATE,BIOTECHGRADE;POTASSIUMBIPHTHALATE,CRYSTAL,REAGENTSPECIAL,ACS; POTASSIUMBIPHTHALATE,ULTRAPURE
