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Merck

179922

Potassium phthalate monobasic

ACS reagent grade, 99.95-100.05% dry basis, crystals, 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
NACRES:
NA.21
PubChem Substance ID:
24850834
UNSPSC Code:
12352100
EC Number:
212-889-4
MDL number:
MFCD00013070
Beilstein/REAXYS Number:
3637128
Assay:
99.95-100.05% dry basis
Grade:
ACS reagent
Form:
crystals
Solubility:
water: soluble (93 g/l at 30 °C (86 °F))

Key Documents

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Product Name

Potassium phthalate monobasic, ACS reagent, acidimetric standard

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.)

solubility

water: soluble (93 g/l at 30 °C (86 °F))

anion traces

chlorine and bromine (as Cl-): ≤0.003%, sulfur compounds (as SO42-): ≤0.002%

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.

wgk

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)

Storage Class

11 - Combustible Solids

Regulatory Listings

Regulatory Listings are mainly provided for chemical products. Only limited information can be provided here for non-chemical products. No entry means none of the components are listed. It is the user’s obligation to ensure the safe and legal use of the product.

179922-500G: + 179922-6X500G: + 179922-1KG: + 179922-5G: + 179922-100G: + 179922-BULK: + 179922-VAR:

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Certificates of Analysis (COA)

Lot/Batch Number
0000546409
0000290151
0000290151
0000546409
MKDB2308

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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)
2, 4, 6-Trinitrobenzoic acid as a primary standerd in acidimetry.
Smith GF and Wilkins DH.
Analytica Chimica Acta, 8, 209-216 (1953)
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
Maria Cristina Fossi et al.
Marine pollution bulletin, 64(11), 2374-2379 (2012-09-12)
Baleen whales are potentially exposed to micro-litter ingestion as a result of their filter-feeding activity. However, the impacts of microplastics on baleen whales are largely unknown. In this case study of the Mediterranean fin whale (Balaenoptera physalus), we explore the
Juanjuan Feng et al.
Journal of chromatography. A, 1268, 16-21 (2012-11-07)
Because of the occurrence of ion exchange between high-ionic-strength solution and anions of polymeric ionic liquids (PILs), PILs based solid-phase microextraction (SPME) fibers were rarely used in direct immersion mode to high-salt-added samples. In this work, a novel double-confined PIL
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