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Potassium hydrogen phthalate

SIAL/NIST185I - NIST® SRM® 185i, pH standard

Synonym: Potassium phthalate monobasic; KHP; Phthalic acid monopotassium salt; Potassium biphthalate; Potassium hydrogen phthalate

CAS Number: 877-24-7
Empirical Formula (Hill Notation): C8H5KO4
Molecular Weight: 204.22
MDL Number: MFCD00013070
Linear Formula: HOOCC6H4COOK
Product Type: Chemical
Catalog Number PKG Qty. Price Quantity
45-NIST185I 60 g
 $1420.00
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agency suitable for SM 2310
  suitable for SM 2320
form crystals
grade certified reference material
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
manufacturer/tradename NIST®
mp 295-300 °C (dec.) (lit.)
packaging pkg of 60 g
Quality Level 100 
SMILES string [K+].OC(=O)c1ccccc1C([O-])=O
Application: Potassium hydrogen phthalate standard reference material (SRM) is intended for use in preparing solutions for calibrating electrodes for pH measuring systems.
Features and Benefits: • SRM 185I is available with certified pH(S) values and their expanded uncertainties. 
• Certified values are derived from potential measurements of cells without liquid junction by the primary measurement method. 
• Certified values are metrologically traceable to the International System of Units (SI) of amount-of-substance and mass and to the definition of single ion activity. 
• The NIST certificate is provided with maintenance, storage, handling, and use instructions.
General description: SRM 185I is certified as a pH standard [pH(S)].   

Each unit of SRM 185I consists of 60 g of potassium hydrogen phthalate.

SRM 185I _SDS 

SRM 185I _CoA 
Legal Information: NIST is a registered trademark of National Institute of Standards and Technology
Legal Information: SRM is a registered trademark of National Institute of Standards and Technology
Other Notes: Please download a current certificate at nist.gov/SRM for current analytes and certified values.
RIDADR NONH for all modes of transport
WGK Germany WGK 3
Flash Point(F) 387.1 °F - Pensky-Martens c
Flash Point(C) 197.3 °C - Pensky-Martens c
mp 295-300 °C (dec.) (lit.)
UNSPSC 41116107

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