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1.01963

Potassium hydrogen tartrate

certified secondary standard reference material for pH measurement; directly traceable to primary SRM from NIST/PTB pH(S) = 3.639 / pH(S) = 3.557 (25°C) Certipur®

Synonym(s):

Potassium hydrogen tartrate, KHT, Monopotassium tartrate, Potassium Bitartrate, Potassium acid tartrate

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About This Item

Empirical Formula (Hill Notation):
C4H5KO6
CAS Number:
868-14-4
Molecular Weight:
188.18
UNSPSC Code:
41116107
EC Index Number:
212-769-1
NACRES:
NA.24
MDL number:
MFCD00065392
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grade

certified reference material

Quality Level

300

agency

complies with DIN 19266

product line

Certipur®

pH

3.4-3.7 (20 °C in H2O, saturated solution)

mp

250 °C (decomposition)

solubility

5.7 g/L

bulk density

720 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@H](O)[C@@H](O)C(=O)O

InChI

1S/C4H6O6.K/c5-1(3(7)8)2(6)4(9)10;/h1-2,5-6H,(H,7,8)(H,9,10);/q;+1/p-1/t1-,2-;/m1./s1

InChI key

KYKNRZGSIGMXFH-ZVGUSBNCSA-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 17034 accredited calibration laboratories against certified primary standard reference materials (SRM) in compliance with DIN 19266, IUPAC, NIST and Ph. Eur. 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 hydrogen tartrate [pH(S) = 3.639 / pH(S) = 3.557 (25 °C)] is a certified secondary standard reference buffer 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 relevant data for the quality management system.
  • The pH value of this Certipur® buffer solution is measured using differential potentiometry with two platinum hydrogen electrodes against NIST & PTB primary SRMs [pH(S) = 3.639 / pH(S) = 3.557 (25 °C)].
  • It is a Certified Reference Material (CRM) offered in neat format.
  • Intended for extremely precise calibration, qualification and monitoring of pH instruments and for testing other buffer solutions.

Analysis Note

pH-value (25 °C): 3.634 - 3.640
Identity: passes test

Legal Information

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

Storage Class

11 - Combustible Solids

wgk

WGK 1

flash_point_f

410.0 °F

flash_point_c

210 °C

Certificates of Analysis (COA)

Search for Certificates of Analysis (COA) by entering the products Lot/Batch Number. Lot and Batch Numbers can be found on a product’s label following the words ‘Lot’ or ‘Batch’.

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