For some European Pharmacopoeia (Ph Eur or EP) procedures, a 0.2 Molar solution is required. So one would dissolve 40.84 grams of this product in some amount of pure water (e.g., 800 mL) in a 1 Liter volumetric flask, bring it to volume with additional pure water, and mix.
A 0.1 Molar solution would therefore require 20.42 grams in 1 Liter of solution.
1.04874
Potassium hydrogen phthalate
for analysis EMSURE® Reag. Ph Eur
Synonym(s):
Potassium hydrogen phthalate
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250 G
$111.00
1 KG
$276.00
About This Item
Empirical Formula (Hill Notation):
C8H5KO4
CAS Number:
Molecular Weight:
204.22
MDL number:
UNSPSC Code:
12352106
EC Index Number:
212-889-4
NACRES:
NA.21
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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grade
reagent grade
Quality Level
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
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Related Categories
1 of 4
This Item | 1.93271 | NIST2185 | NIST84L |
|---|---|---|---|
| form solid | form - | form crystals | form - |
| assay ≥99.5% dry basis (perchloric acid titration) | assay - | assay - | assay - |
| Quality Level 300 | Quality Level - | Quality Level 100 | Quality Level 100 |
| density 1.636 g/cm3 | density - | density - | density - |
| pH 4.0 (20 °C, 50 g/L in H2O) | pH - | pH - | pH - |
| anion traces chloride (Cl-): ≤0.002%, sulfur compounds (as SO42-): ≤0.005% | anion traces - | anion traces - | anion traces - |
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
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
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
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Protocols
Photometric determination using the Griess method subsequent to extraction
Determinación fotométrica utilizando el método Griess posterior a la extracción
Spectrophotometric Griess assay protocol for quantitative nitrite analysis in dried meat after extraction with potassium hydrogen phthalate.
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