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1.09138 Supelco

Sodium hydroxide solution

c(NaOH) = 0.5 mol/l (0.5 N) Titripur®



Related Categories Analytical Reagents, Analytical/Chromatography, Titration, Volumetric Titration Reagents
Agency/Method   ISO 17025
Quality Level   100
vapor pressure   3 mmHg ( 37 °C)
form   liquid
reaction suitability   reaction type: Acid-base reactions
concentration   0.5 M
application(s)   titration: suitable
pH   13.5 (20 °C in H2O)
density   1.02 g/cm3 at 20 °C
SMILES string   [OH-].[Na+]
InChI   1S/Na.H2O/h;1H2/q+1;/p-1
storage conditions   Store at +15°C to +25°C.


Features and Benefits

This volumetric solution is certified according to DIN EN ISO/IEC 17025. The accreditation certificate can be found at www.sigmalaldrich.com/ISO17025


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


Replaces: SX0607E; SX0607E-9; SX0607E-3

Analysis Note

Form: liquid
Amount-of-substance concentration: 0.4975 - 0.5025
Measurement uncertainty: +/- 0.0015
Traceability: NIST SRM
The concentration is determined by volumetric titration and refers to 20°C.
The certified value of this volumetric solution was determined with hydrochloric acid standard solution (article number 1.09060). The hydrochloric acid standard solution is standardized and traceable to a primary standard from the National Institute of Standards and Technology, Gaithersburg, USA (NIST SRM 723 Tris(hydroxymethyl)aminomethane) by means of volumetric standard Tris(hydroxymethyl)aminomethane (Art. 1.02408). This volumetric standard is certified by the accredited calibration laboratory of Merck KGaA, Darmstadt, Germany according to DIN EN ISO 17025. The uncertainty is expressed as expanded measurement uncertainty with a coverage factor k=2 covering a confidence level of 95%. All measurements are carried out in the accredited calibration laboratory of Merck KGaA, Darmstadt, Germany.
Note: The titer is a correction factor to correct for variations of the volumetric solution, the titration equipment, the temperature and other laboratory conditions. For correct titration results it is recommended to determine a titer with the laboratory specific equipment and under laboratory specific conditions directly after opening a new bottle and at regular time intervals.

Legal Information

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

Safety & Documentation

Safety Information

Protocols & Articles


Analytical Method: Ultrasensitive determination of silicate in process and boiler water

Reagents Cat. No. 101813 – Spectroquant® Silicate (Silicic Acid) Test Cat. No. 101262 – Water Ultrapur Cat. No. 109138 – Sodium hydroxide solution 0.5 mol/L Titripur® Cat. No. 112310 – Silicium stand...
Keywords: Atomic absorption spectroscopy, Sample preparations

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