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60360

Potassium phthalate monobasic

Name: Potassium phthalate monobasic
Brand: SIAL

puriss. p.a., ≥99.5% (T)

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

UNSPSC Code:

12352302

NACRES:

NA.21

PubChem Substance ID:

329758904

EC Number:

212-889-4

Beilstein/REAXYS Number:

3637128

MDL number:

MFCD00013070

Assay:

≥99.5% (T)

Form:

solid

Solubility:

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

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Properties

grade

puriss. p.a.

Quality Level

200

assay

≥99.5% (T)

form

solid

pH

mp

295-300 °C (dec.) (lit.)

solubility

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

anion traces

chloride (Cl^-): ≤20 mg/kg, sulfate (SO₄^2-): ≤50 mg/kg

cation traces

Ca: ≤10 mg/kg, Cd: ≤5 mg/kg, Co: ≤5 mg/kg, Cr: ≤5 mg/kg, Cu: ≤5 mg/kg, Fe: ≤5 mg/kg, Mg: ≤5 mg/kg, Mn: ≤5 mg/kg, Na: ≤100 mg/kg, Ni: ≤5 mg/kg, Pb: ≤5 mg/kg, Zn: ≤5 mg/kg

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

Description

General description

Potassium phthalate monobasic (KHP) is the monopotassium salt of pthalic acid. It has been proposed as a certified reference material (CRM) under ISO/IEC 17025 and ISO Guide 34 accreditation. Its spectral shift, multiplicity, solubility and relaxation times in different solvents have been reported.

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.

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Storage Class

11 - Combustible Solids

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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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)

Development of an ionic liquid-based dispersive liquid-liquid microextraction method for the determination of nifurtimox and benznidazole in human plasma.

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

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Global Trade Item Number

SKU	GTIN
60360-100G	04061835517923
60360-1KG	04061835555314
60360-500G	04061835555321