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60360

Sigma-Aldrich

Potassium phthalate monobasic

puriss. p.a., ≥99.5% (T)

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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

puriss. p.a.

Quality Level

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

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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P108860357179922
Potassium phthalate monobasic puriss. p.a., ≥99.5% (T)

60360

Potassium phthalate monobasic

-
Potassium hydrogen phthalate BioXtra, ≥99.95%

P1088

Potassium hydrogen phthalate

Premium Grade
Potassium phthalate monobasic reference material for titrimetry, certified by BAM, ≥99.5%

60357

Potassium phthalate monobasic

-
Potassium phthalate monobasic ACS reagent, acidimetric standard

179922

Potassium phthalate monobasic

-
assay

≥99.5% (T)

assay

≥99.95%

assay

≥99.5%

assay

99.95-100.05% dry basis

Quality Level

200

Quality Level

200

Quality Level

-

Quality Level

200

grade

puriss. p.a.

grade

-

grade

-

grade

-

cation traces

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

cation traces

Al: <0.0005%, Ca: <0.005%, Cu: <0.0005%, Fe: <0.0005%, Mg: <0.0005%, NH4+: <0.05%, Na: <0.005%, Pb: <0.001%, Zn: <0.0005%

cation traces

-

cation traces

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

anion traces

chloride (Cl-): ≤20 mg/kg, sulfate (SO42-): ≤50 mg/kg

anion traces

chloride (Cl-): <0.003%, sulfur compounds (as SO42-): ≤0.002%

anion traces

-

anion traces

-

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.

Storage Class

11 - 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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