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179922

Sigma-Aldrich

Potassium phthalate monobasic

ACS reagent, acidimetric standard

Synonym(s):

KHP, Phthalic acid monopotassium salt, Potassium biphthalate, Potassium hydrogen phthalate

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About This Item

Linear Formula:
HOOCC6H4COOK
CAS Number:
877-24-7
Molecular Weight:
204.22
Beilstein:
3637128
EC Number:
212-889-4
MDL number:
MFCD00013070
UNSPSC Code:
12352100
PubChem Substance ID:
24850834
NACRES:
NA.21

grade

ACS reagent

Quality Level

200

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)

functional group

carboxylic acid

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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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 Code

13 - Non Combustible Solids

WGK

WGK 1

Flash Point(F)

387.1 °F - Pensky-Martens closed cup

Flash Point(C)

197.3 °C - Pensky-Martens closed cup

Personal Protective Equipment

dust mask type N95 (US), Eyeshields, Gloves

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Certificates of Analysis (COA)

Lot/Batch Number
0000370041
0000325000
MKCW7100
0000370041
MKCW2084

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2, 4, 6-Trinitrobenzoic acid as a primary standerd in acidimetry.
Smith GF and Wilkins DH.
Analytica Chimica Acta, 8, 209-216 (1953)
Determination of standard pH values for potassium hydrogen phthalate reference buffer solutions in 10, 20, 50, 64 and 84.2 wt per cent methanol/water mixed solvents at temperatures from 283.15 to 313.15 K.
Mussini T, et al.
Electrochimica Acta, 28(11), 1593-1598 (1983)
J M Padró et al.
Talanta, 107, 95-102 (2013-04-20)
Dispersive ionic liquid-liquid microextraction combined with liquid chromatography and UV detection was used for the determination of two antichagasic drugs in human plasma: nifurtimox and benznidazole. The effects of experimental parameters on extraction efficiency-the type and volume of ionic liquid
H Fromme et al.
Environment international, 61, 64-72 (2013-10-10)
Phthalates have been used for decades in large quantities, leading to the ubiquitous exposure of the population. In an investigation of 63 German daycare centers, indoor air and dust samples were analyzed for the presence of 10 phthalate diesters. Moreover
Tye E Arbuckle et al.
Environment international, 68, 55-65 (2014-04-09)
Bisphenol A (BPA) and phthalates are endocrine disruptors possibly linked to adverse reproductive and neurodevelopmental outcomes. These chemicals have commonly been measured in urine in population surveys; however, such data are limited for large populations of pregnant women, especially for
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