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Description
Catalogue Number	109073

Physicochemical Information
Density	1.02 g/cm3 (20 °C)
pH value	1.0 (H₂O, 20 °C)

Safety Information according to GHS
Hazard Pictogram(s)
Hazard Statement(s)	H290: May be corrosive to metals.
Precautionary Statement(s)	P234: Keep only in original packaging. P390: Absorb spillage to prevent material damage.
Signal Word	Warning
Storage class	8B Non-combustible, corrosive hazardous materials
WGK	NWG not water endangering
Disposal	28 Aqueous solutions: Container D.

Storage and Shipping Information
Storage	Store at +15°C to +25°C.

Transport Information
Declaration (railroad and road) ADR, RID	UN 3264 , 8, III
Declaration (transport by air) IATA-DGR	UN 3264 , 8, III
Declaration (transport by sea) IMDG-Code	UN 3264 , 8, III, Segregation Group: 1 (Acids)

Specifications
Form	liquid
Amount-of-substance concentration	0.24875 – 0.25125
Measurement uncertainty	+/- 0.00075
Traceability	NIST SRM
The amount-of-substance concentration of this volumetric solution is analyzed by our quality control laboratory of Merck KGaA, Darmstadt, Germany according to DIN EN ISO/IEC 17025. The concentration is determined by volumetric titration and refers to 20°C. The amount-of-substance concentration of this volumetric solution is traceable to a primary standard reference material (SRM) from the National Institute of Standards and Technology, Gaithersburg, USA (NIST SRM 723 Tris(hydroxymethyl)aminomethane) by means of volumetric standard Tris(hydroxymethyl)aminomethane (article number 1.02408), certified reference material according to ISO 17034, analyzed by our accredited calibration laboratory of Merck KGaA, Darmstadt, Germany according to DIN EN ISO/IEC 17025. The uncertainty is expressed as expanded measurement uncertainty with a coverage factor k=2 covering a confidence level of 95%. 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.

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