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Description
Catalogue Number	109137

Physicochemical Information
Density	1.04 g/cm3 (20 °C)
pH value	13.7 (H₂O, 20 °C)

Safety Information according to GHS
Hazard Pictogram(s)
Hazard Statement(s)	H290: May be corrosive to metals. H314: Causes severe skin burns and eye damage.
Precautionary Statement(s)	P234: Keep only in original packaging. P280: Wear protective gloves/ protective clothing/ eye protection/ face protection/ hearing protection. P303 + P361 + P353: IF ON SKIN (or hair): Take off immediately all contaminated clothing. Rinse skin with water. P304 + P340 + P310: IF INHALED: Remove person to fresh air and keep comfortable for breathing. Immediately call a POISON CENTER/doctor. P305 + P351 + P338: IF IN EYES: Rinse cautiously with water for several minutes. Remove contact lenses, if present and easy to do. Continue rinsing. P363: Wash contaminated clothing before reuse.
Signal Word	Danger
Storage class	8B Non-combustible, corrosive hazardous materials
WGK	WGK 1 slightly hazardous to water
Disposal	13 Bases and alcoholates should be diluted if necessary by carefully stirring them into water and then neutralized (protective gloves, fume cupboard!) with hydrochloric acid (Cat. No. 100312). Before placing in container D, check the pH with pH universal indicator strips (Cat. No. 109535).

Safety Information
Categories of danger	corrosive

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

Transport Information
Declaration (railroad and road) ADR, RID	UN 1824 , 8, II
Declaration (transport by air) IATA-DGR	UN 1824 , 8, II
Declaration (transport by sea) IMDG-Code	UN 1824 , 8, II, Segregation Group: 18 (Alkalis)

Specifications
Form	liquid
Amount-of-substance concentration	0.995 – 1.005
Measurement uncertainty	+/- 0.003
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 84 potassium hydrogen phthalate) by means of volumetric standard potassium hydrogen phthalate (article number 1.02400), 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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