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1.01961

Potassium tetraoxalate dihydrate

certified secondary standard reference material for pH measurement; directly traceable to primary reference material from NIST/PTB pH (S) = 1.679 (25°C) Certipur®

Synonym(s):

Potassium tetraoxalate dihydrate, Oxalic acid hemipotassium salt, Potassium hydrogen oxalate-oxalic acid-water (1/1/2)

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About This Item

Empirical Formula (Hill Notation):
C4H3KO8 · 2H2O
CAS Number:
6100-20-5
Molecular Weight:
254.19
UNSPSC Code:
41116107
EC Index Number:
204-874-6
NACRES:
NA.24
MDL number:
MFCD00150443
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grade

certified reference material

Quality Segment

agency

complies with DIN 19266

product line

Certipur®

pH

1.7 (25 °C, 12.6 g/L in H2O)

solubility

25 g/L

density

1.84 g/cm3 at 20 °C

bulk density

860 kg/m3

application(s)

environmental
food and beverages
general analytical
industrial qc
pharmaceutical

format

neat

storage temp.

15-25°C

SMILES string

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

InChI

1S/2C2H2O4.K/c2*3-1(4)2(5)6;/h2*(H,3,4)(H,5,6);/q;;+1/p-1

InChI key

GANDVAJEIJXBQJ-UHFFFAOYSA-M

General description

Certipur® certified secondary standard reference buffers are used to precisely calibrate and monitor pH measurement instruments and buffer solutions. They are quality controlled and qualified in our ISO/IEC 17025 and ISO 17034 accredited calibration laboratories against certified primary standard reference materials (SRM) in compliance with DIN 19266, IUPAC, NIST, Ph. Eur and USP. Certipur® reference materials offer maximum accuracy, reliability and convenience and help avoid costly repeat analyses.
Please visit ISO certificates and Site Quality Self-Assessments to access the current certificates of accreditation.
Download your certificate at http://www.sigma-aldrich.com to view certified values, including uncertainty and expiry date.

Application

Potassium tetraoxalate dihydrate [pH (S) = 1.67₉ (25 °C)] is a certified secondary standard reference material used as a calibration buffer standard for pH instruments or pH electrodes.

Features and Benefits

  • The product is delivered with a comprehensive, batch-specific Certificate of Analysis showing the relevant data for the quality management system.
  • The pH value of this Certipur® buffer solution is qualified using differential potentiometry with two platinum hydrogen electrodes against NIST & PTB primary reference materials [pH (S) = 1.679 (25 °C)].
  • This buffer standard has a guaranteed shelf life of 4 years.
  • Potassium tetraoxalate dihydrate buffer is a Certified Reference Material (CRM) offered in neat format. Solution of this standard is prepared in-house following instructions in European Pharmacopoeia (Ph. Eur. 2.2.3).
  • Intended for extremely precise calibration, qualification and monitoring of pH instruments and routine assessment of their performance.

Analysis Note

pH-value (25 °C): 1.674 - 1.683

Legal Information

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

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Pictograms

Exclamation mark
GHS07

Signal Word

Warning

Hazard Codes

H302 + H312,H319

Hazard Classifications

Acute Tox. 4 Dermal - Acute Tox. 4 Oral - Eye Irrit. 2

Storage Class

11 - Combustible Solids

WGK

WGK 1

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