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1.04874

Potassium hydrogen phthalate

for analysis EMSURE® Reag. Ph Eur

Synonym(s):

Potassium hydrogen phthalate

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About This Item

Empirical Formula (Hill Notation):
C8H5KO4
CAS Number:
877-24-7
Molecular Weight:
204.22
UNSPSC Code:
12352106
EC Index Number:
212-889-4
NACRES:
NA.21
MDL number:
MFCD00013070
Assay:
≥99.5% dry basis (perchloric acid titration)
Grade:
reagent grade
Form:
solid
Solubility:
water: soluble (93 g/l (86 °F / 30 °C))
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Quality Level

300

grade

reagent grade

agency

reag. Ph. Eur.

product line

EMSURE®

assay

≥99.5% dry basis (perchloric acid titration)

form

solid

potency

>3200 mg/kg LD50, oral (Rat)

impurities

≤0.005% In water insoluble matter

loss

≤0.2% loss on drying, 105°C

pH

4.0 (20 °C, 50 g/L in H2O)

mp

295-300 °C

solubility

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

density

1.636 g/cm3

bulk density

900 kg/m3

anion traces

chloride (Cl-): ≤0.002%, sulfur compounds (as SO42-): ≤0.005%

cation traces

Cu: ≤0.0002%, Fe: ≤0.0005%, Na: ≤0.01%, Pb: ≤0.0005%, heavy metals (as Pb): ≤0.0005%

storage temp.

2-30°C

SMILES string

[K+].[O-]C(=O)c1c(cccc1)C(=O)[O-].[H+]

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

Application


  • Coulometric method with titratable impurity analysis and mass balance method: This study presents a method to convert acidimetric purity to chemical purity for potassium hydrogen phthalate, which is validated using quantitative nuclear magnetic resonance (qNMR) techniques, enhancing the standards for analytical chemistry (Huang T et al., 2023).

  • Triplet states of the nonlinear optical chromophore DCM in single crystals: Investigates the triplet excited states of the nonlinear optical chromophore DCM in potassium hydrogen phthalate single crystals, linking these states to single-molecule dark states, significant for the development of optical materials (Barbon A et al., 2009).


Analysis Note

Assay (Perchloric acid titration from dried substance): ≥ 99.5 %
Identity (IR-spectrum): passes test
In water insoluble matter: ≤ 0.005 %
Chloride (Cl): ≤ 0.002 %
Sulfur compounds (as SO₄): ≤ 0.005 %
Heavy metals (as Pb): ≤ 0.0005 %
Cu (Copper): ≤ 0.0002 %
Fe (Iron): ≤ 0.0005 %
Na (Sodium): ≤ 0.01 %
Pb (Lead): ≤ 0.0005 %
Loss on Drying (105°C): ≤ 0.2 %
Corresponds to Reag. Ph Eur

Legal Information

EMSURE is a registered trademark of Merck KGaA, Darmstadt, Germany

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Storage Class

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

Certificates of Analysis (COA)

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