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Potassium hydrogen phthalate

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Potassium hydrogen phthalate Basic information

Product Name:
Potassium hydrogen phthalate
Synonyms:
  • Potassium hydrogen phthalate, reagent ACS, acidimetric standard
  • POTASSIUM ACID PHTHALATE BIO-REFINED
  • POTASSIUM ACID PHTHALATE BUFFER GRADE
  • potassium hydrogen phthalate, primary standard, acs
  • POTASSIUMBIPHTHALATE,BIOTECHGRADE
  • POTASSIUMBIPHTHALATE,CRYSTAL,REAGENTSPECIAL,ACS
  • POTASSIUMBIPHTHALATE,ULTRAPURE
  • SODIUM AMYL XANTHTATE
CAS:
877-24-7
MF:
C8H5KO4
MW:
204.22
EINECS:
212-889-4
Product Categories:
  • Analytical reagent
  • Classes of Metal Compounds
  • INORGANIC & ORGANIC CHEMICALS
  • K (Potassium) Compounds (excluding simple potassium salts)
  • Typical Metal Compounds
Mol File:
877-24-7.mol
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Potassium hydrogen phthalate Chemical Properties

Melting point:
295-300 °C (dec.) (lit.)
Boiling point:
98.5-99.5 ;°C/740 ;mmHg(lit .)
Density 
1.006 g/mL at 20 °C
storage temp. 
Store at +5°C to +30°C.
solubility 
H2O: 100 mg/mL, clear, colorless
form 
Solid
color 
White
Odor
Odorless
PH Range
3.8 - 4.0 (5% aq. sol.)
PH
4.00-4.02 (25.0℃±0.2℃, 0.05M)
Water Solubility 
80 G/L (20 ºC)
Merck 
14,7612
BRN 
3637128
Stability:
Stable. Incompatible with strong oxidizing agents.
InChIKey
IWZKICVEHNUQTL-UHFFFAOYSA-M
LogP
-2.73
CAS DataBase Reference
877-24-7(CAS DataBase Reference)
EPA Substance Registry System
Monopotassium phthalate (877-24-7)
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Safety Information

Hazard Codes 
Xi,C,T
Risk Statements 
36/38-36/37/38-34-61-60
Safety Statements 
26-36-24/25-22-45-36/37/39-53
RIDADR 
UN 1789 8/PG 3
WGK Germany 
1
RTECS 
CZ4326000
34
TSCA 
Yes
HS Code 
29173990
Toxicity
LD50 orally in Rabbit: > 3200 mg/kg

MSDS

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Potassium hydrogen phthalate Usage And Synthesis

Chemical Properties

white crystalline powder

Uses

As primary standard for preparing volumetric alkali solutions, also as a buffer in pH determinations.

Uses

As a primary standard for preparing volumetric alkali solutions and as a buffer in pH determinations. Potassium hydrogen phthalate is used as a primary standard for acid- base titrations as well as for calibrating pH meters. It acts as a buffer in pH determination. It finds application as a useful standard for total organic carbon testing.

Uses

Potassium hydrogen phthalate [KHP; pH(S) = 4.005 (25 °C)] is a certified secondary standard reference material used as a calibration buffer standard for pH instruments or pH electrodes.

General Description

SRM 2185_cert SRM 2185 _SDS

Flammability and Explosibility

Not classified

Purification Methods

Crystallise it first from a dilute aqueous solution of K2CO3, then H2O (3mL/g) between 100o and 0o. Before being used as a standard in volumetric analysis, analytical grade potassium hydrogen phthalate should be dried at 120o for 2hours, then allowed to cool in a desiccator. [Beilstein 9 IV 3169.]

Potassium hydrogen phthalate Preparation Products And Raw materials

Raw materials

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