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)

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

F 

34

TSCA 

Yes

HS Code 

29173990

Toxicity

LD50 orally in Rabbit: > 3200 mg/kg

MSDS

• Language:English Provider:SigmaAldrich
• Language:English Provider:ALFA

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(877-24-7)Related Product Information

• Potassium persulfate
• Phthalic anhydride
• Ethyl 2-(Chlorosulfonyl)acetate
• Potassium iodide
• Losartan potassium
• Dibutyl phthalate
• Bis(2-methoxyethyl) phthalate
• Potassium Bitartrate
• Potassium sorbate
• Citalopram hydrobromide
• Folic acid
• Potassium sulfate
• Isophthalic acid
• Phthalic acid
• Hydrogen
• Diethyl phthalate
• Bis(2-ethylhexyl) phthalate
• Glycine