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60360

Sigma-Aldrich

Potassium phthalate monobasic

puriss. p.a., ≥99.5% (T)

Synonym(s):

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

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0.1 MG
CN¥1,837.96
0.5 MG
CN¥9,762.57

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0.1 MG
CN¥1,837.96
0.5 MG
CN¥9,762.57

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:
12352302
PubChem Substance ID:
329758904
NACRES:
NA.21
form:
solid

CN¥1,837.96

Estimated to ship onAugust 06, 2025Details

New, lower price on this item!
Request a Bulk Order

grade

puriss. p.a.

Quality Level

200

Assay

≥99.5% (T)

form

solid

pH

4

mp

295-300 °C (dec.) (lit.)

anion traces

chloride (Cl-): ≤20 mg/kg
sulfate (SO42-): ≤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

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form

liquid

form

liquid

form

buffered aqueous solution

form

liquid

storage temp.

−20°C

storage temp.

−20°C

storage temp.

−20°C

storage temp.

−20°C

usage

100 uses (0.1 mg size)

usage

100 uses (0.1 mg size), 1000 uses (1 mg size), 20 uses (20 μg size), 500 uses (0.5 mg size)

usage

100 uses (0.1 mg size), 20 uses (20 μg size)

usage

200 uses (0.1 mg size), 40 uses (20 μg size)

suitability

suitable for electrophoresis (DNA)

suitability

suitable for electrophoresis (DNA)

suitability

suitable for electrophoresis (DNA)

suitability

suitable for electrophoresis (DNA)

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.[1]

Application

Potassium phthalate monobasic may be used as a primary standard in acidimetric titration[2] and also to prepare potassium phthalate buffer solution for pH calibration.[3][4]

Storage Class Code

11 - 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
  • Specification Sheet

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    Certificates of Analysis (COA)

    Lot/Batch Number
    BCCM8646
    BCCM1172
    BCCJ8635
    BCCK8601
    BCCH1885

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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
    Randi J Bertelsen et al.
    Environmental health perspectives, 121(2), 251-256 (2012-11-21)
    High-molecular-weight phthalates in indoor dust have been associated with asthma in children, but few studies have evaluated phthalate biomarkers in association with respiratory outcomes. We explored the association between urinary concentrations of phthalate metabolites and current asthma. In a cross-sectional
    View All Related Papers

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