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Potassium phthalate monobasic

Name: Potassium phthalate monobasic
Brand: SIGMA

BioUltra, ≥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:

12161700

NACRES:

NA.21

PubChem Substance ID:

57651755

EC Number:

212-889-4

Beilstein/REAXYS Number:

3637128

MDL number:

MFCD00013070

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Properties

product line

BioUltra

Quality Segment

200

assay

≥99.5% (T)

form

powder or crystals

impurities

insoluble matter, passes filter test

loss

≤0.05% loss on drying, 110 °C

pH

3.5-5.0 (25 °C, 0.1 M in H₂O)

mp

295-300 °C (dec.) (lit.)

solubility

H₂O: 0.1 M at 20 °C, clear, colorless

anion traces

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

cation traces

Al: ≤5 mg/kg, As: ≤0.1 mg/kg, Ba: ≤5 mg/kg, Bi: ≤5 mg/kg, Ca: ≤10 mg/kg, Cd: ≤5 mg/kg, Co: ≤5 mg/kg, Cr: ≤5 mg/kg, Cu: ≤5 mg/kg, Fe: ≤5 mg/kg, Li: ≤5 mg/kg, Mg: ≤5 mg/kg, Mn: ≤5 mg/kg, Mo: ≤5 mg/kg, Na: ≤100 mg/kg, Ni: ≤5 mg/kg, Pb: ≤5 mg/kg, Sr: ≤5 mg/kg, Zn: ≤5 mg/kg

absorption

cut-off at 309 nm in H₂O at 0.1 M

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

Application

Potassium hydrogen phthalate may be used as a buffering agent or as a standard for total organic carbon (TOC) calibration and may be used to asses the oxidating activity of CNTs/TiO(2) photoanodes. Potassium hydrogen phthalate solution may be used as a liquid filter to reduce the effects of Rayleigh scattering on collected Raman spectra.

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This Item	60360	24-4070	60357
Sigma-Aldrich 60359 Potassium phthalate monobasic	Sigma-Aldrich 60360 Potassium phthalate monobasic	Sigma-Aldrich 24-4070 Potassium phthalate monobasic	Supelco 60357 Potassium phthalate monobasic
assay ≥99.5% (T)	assay ≥99.5% (T)	assay 99.8-100.2%	assay >99.5%
Quality Level 200	Quality Level 200	Quality Level -	Quality Level 100
product line BioUltra	product line -	product line -	product line -
form powder or crystals	form solid	form solid	form -
pH 3.5-5.0 (25 °C, 0.1 M in H₂O)	pH 4	pH 4	pH 4
solubility H₂O: 0.1 M at 20 °C, clear, colorless	solubility water: soluble (93 g/l at 30 °C (86 °F))	solubility -	solubility -

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