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877-24-7

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Identification

Name
Potassium hydrogen phthalate
CAS
877-24-7
Synonyms
BLUE HIGH-ACCURACY BUFFER, PH 10.000
BUFFER
BUFFER CONCENTRATE, PH 6.00
BUFFER CONCENTRATE, PH 7.00
BUFFER MIXTURE, PH 6.8
BUFFER O
BUFFER, PH 1.0
BUFFER, PH 1.00
BUFFER, PH 10.00
BUFFER, PH 10.00, COLOR CODE BLUE
BUFFER, PH 1.07
BUFFER PH 10, BLUE
BUFFER, PH 11.00
BUFFER, PH 1.2
BUFFER, PH 12.00
BUFFER, PH 12.45
BUFFER, PH 12.72
BUFFER, PH 1.68
BUFFER, PH 2.00
BUFFER, PH 2.5
EINECS(EC#)
212-889-4
Molecular Formula
C8H5KO4
MDL Number
MFCD00146206
Molecular Weight
204.22
MOL File
877-24-7.mol

Chemical Properties

Appearance
white crystalline powder
Melting point 
295-300 °C (dec.) (lit.)
mp 
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 RT.
solubility 
H2O: 100 mg/mL, clear, colorless

form 
Solid
color 
White
Stability:
Stable. Incompatible with strong oxidizing agents.
PH
4.00-4.02 (25.0℃±0.2℃, 0.05M)
PH Range
3.8 - 4.0 (5% aq. sol.)
Odor
Odorless
Water Solubility 
80 G/L (20 ºC)
Merck 
14,7612
BRN 
3637128
InChIKey
IWZKICVEHNUQTL-UHFFFAOYSA-M
CAS DataBase Reference
877-24-7(CAS DataBase Reference)
EPA Substance Registry System
877-24-7(EPA Substance)

Safety Data

Hazard Codes 
Xi,C
Risk Statements 
R36/38:Irritating to eyes and skin .
R36/37/38:Irritating to eyes, respiratory system and skin .
R34:Causes burns.
Safety Statements 
S26:In case of contact with eyes, rinse immediately with plenty of water and seek medical advice .
S36:Wear suitable protective clothing .
S24/25:Avoid contact with skin and eyes .
S22:Do not breathe dust .
S45:In case of accident or if you feel unwell, seek medical advice immediately (show label where possible) .
S36/37/39:Wear suitable protective clothing, gloves and eye/face protection .
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

Raw materials And Preparation Products

Hazard Information

Chemical Properties
white crystalline powder
Uses
As primary standard for preparing volumetric alkali solutions, also as a buffer in pH determinations.
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.]

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