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179922

Sigma-Aldrich

Potassium phthalate monobasic

ACS reagent, acidimetric standard

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Synonym(s):
KHP, Phthalic acid monopotassium salt, Potassium biphthalate, Potassium hydrogen phthalate
Linear Formula:
HOOCC6H4COOK
CAS Number:
Molecular Weight:
204.22
Beilstein/REAXYS Number:
3637128
EC Number:
MDL number:
PubChem Substance ID:
NACRES:
NA.21

grade

ACS reagent

Quality Level

assay

99.95-100.05% dry basis

form

crystals

quality

acidimetric standard

impurities

≤0.002% S compounds
≤0.003% Cl compounds
≤0.005% insolubles

pH

4.00-4.02 (25.0 °C±0.2 °C, 0.05 M)

mp

295-300 °C (dec.) (lit.)

cation traces

Fe: ≤5 ppm
Na: ≤0.005%
heavy metals: ≤5 ppm (by ICP)

SMILES string

[K+].OC(=O)c1ccccc1C([O-])=O

InChI

1S/C8H6O4.K/c9-7(10)5-3-1-2-4-6(5)8(11)12;/h1-4H,(H,9,10)(H,11,12);/q;+1/p-1

InChI key

IWZKICVEHNUQTL-UHFFFAOYSA-M

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This Item
PX147660360P1088
vibrant-m

179922

Potassium phthalate monobasic

-
vibrant-m

PX1476

Potassium Hydrogen Phthalate

-
vibrant-m

60360

Potassium phthalate monobasic

-
vibrant-m

P1088

Potassium hydrogen phthalate

Premium Grade
Quality Level

200

Quality Level

200

Quality Level

200

Quality Level

200

form

crystals

form

solid

form

solid

form

powder or crystals

impurities

≤0.002% S compounds, ≤0.005% insolubles, ≤0.003% Cl compounds

impurities

≤0.002% Sulfur compounds (as S), ≤0.005% Insoluble matter

impurities

-

impurities

<0.005% Insoluble matter, <0.005% Phosphorus (P)

grade

ACS reagent

grade

-

grade

-

grade

-

mp

295-300 °C (dec.) (lit.)

mp

295-300 °C

mp

295-300 °C (dec.) (lit.)

mp

295-300 °C (dec.) (lit.)

Application

Potassium phthalate monobasic may be used as a primary standard in acidimetric titration and also to prepare potassium phthalate buffer solution for pH calibration.

Storage Class

13 - Non Combustible Solids

wgk_germany

WGK 1

flash_point_f

387.1 °F - Pensky-Martens closed cup

flash_point_c

197.3 °C - Pensky-Martens closed cup

ppe

Eyeshields, Gloves, type N95 (US)


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