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Potassium hydrogen phthalate

Volumetric standard, secondary reference material for alkalimetry, traceable to NIST Standard Reference Material (SRM) Certipur® Reag. Ph Eur

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Synonym(s):
Potassium hydrogen phthalate
Empirical Formula (Hill Notation):
C8H5KO4
CAS Number:
Molecular Weight:
204.22
MDL number:
EC Index Number:
212-889-4

Agency

ISO 17025
reag. Ph. Eur.

Quality Level

form

solid

potency

>3200 mg/kg LD50, oral (Rat)

technique(s)

titration: suitable

pH

4.0 (20 °C, 50 g/L in H2O)

mp

295-300 °C

solubility

80 g/L

density

1.636 g/cm3

bulk density

900 kg/m3

storage temp.

15-25°C

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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This Item
1.01965NIST84LNIST2185
Potassium hydrogen phthalate NIST® SRM® 84l

NIST84L

Potassium hydrogen phthalate

Potassium hydrogen phthalate NIST® SRM® 2185, pD standard

NIST2185

Potassium hydrogen phthalate

technique(s)

titration: suitable

technique(s)

-

technique(s)

titration: suitable

technique(s)

-

form

solid

form

-

form

-

form

crystals

potency

>3200 mg/kg LD50, oral (Rat)

potency

>3200 mg/kg LD50, oral (Rat)

potency

-

potency

-

pH

4.0 (20 °C, 50 g/L in H2O)

pH

4.0 (20 °C, 50 g/L in H2O)

pH

-

pH

-

mp

295-300 °C

mp

295-300 °C

mp

295-300 °C (dec.) (lit.)

mp

295-300 °C (dec.) (lit.)

General description

Potassium hydrogen phthalate, also known as KHP, is a volumetric standard manufactured under stringent conditions and measured with the highest possible precision. Its mass fraction is determined by potentiometric titration, and it is qualified in a DIN EN ISO/IEC 17025 accredited laboratory.

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

It finds its use as a certified reference material (CRM) for the standardization of volumetric solutions in alkalimetric titrations, according to Ph. Eur. It is also used to prepare a standard solution in determination of COD.

Features and Benefits

  • Available as a solid in a secure glass bottle to ensure its stability for the entire shelf life until opened.
  • Certified reference material according to ISO 17034
  • High-purity material traceable to NIST SRMs
  • Qualified in a DIN EN ISO/IEC 17025 accredited laboratory
  • In accordance with the chapter reagents of Ph. Eur
  • High-quality offering accurate titer determinations
  • Accompanied by a certificate of analysis (CoA)

Packaging

SKU-pack size numbers ending with a "3" are SmartChemicals with an RFID tag on the label for seamless data transfer to the instrument, e.g. xxxxxx1003 or xxxxxxx 4003. More information on www.sigmaaldrich.com/SmartChemicals

Legal Information

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

related product

Product No.
Description
Pricing

Storage Class Code

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)

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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Example:

T1503
Product Number
-
25G
Pack Size/Quantity

Additional examples:

705578-5MG-PW

PL860-CGA/SHF-1EA

MMYOMAG-74K-13

1000309185

enter as 1.000309185)

Having trouble? Feel free to contact Technical Service for assistance.

Lot and Batch Numbers can be found on a product's label following the words 'Lot' or 'Batch'.

Aldrich Products

  • For a lot number such as TO09019TO, enter it as 09019TO (without the first two letters 'TO').

  • For a lot number with a filling-code such as 05427ES-021, enter it as 05427ES (without the filling-code '-021').

  • For a lot number with a filling-code such as STBB0728K9, enter it as STBB0728 without the filling-code 'K9'.

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Articles

Preparation of a standard solution for COD/chloride

The titer determination or standardization of a titration solution is essential for accurate and reliable titration results.

SmartChemicals enable wireless transfer of CoA data stored on an RFID tag on the consumable bottle to the titrator, reducing effort and chance for human error. Crucial data required for the application is transmitted safely, reliably and intelligently to the instrument.

Our team of scientists has experience in all areas of research including Life Science, Material Science, Chemical Synthesis, Chromatography, Analytical and many others.

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