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Description
Catalogue Number	106591
Replaces	SX0740-1
Synonyms	tetra-Sodium pyrophosphate, TSPP
Description	tetra-Sodium diphosphate decahydrate

Physicochemical Information
Density	1.82 g/cm3 (20 °C)
Melting Point	988 °C (anhydrous substance)
pH value	10.2 (10 g/l, H₂O, 25 °C)
Bulk density	650 kg/m3
Solubility	60 g/l (anhydrous substance)

Safety Information according to GHS
Hazard Pictogram(s)
Hazard Statement(s)	H302: Harmful if swallowed. H318: Causes serious eye damage.
Precautionary Statement(s)	P264: Wash skin thoroughly after handling. P270: Do not eat, drink or smoke when using this product. P280: Wear eye protection/ face protection. P301 + P312: IF SWALLOWED: Call a POISON CENTER/doctor if you feel unwell. P305 + P351 + P338: IF IN EYES: Rinse cautiously with water for several minutes. Remove contact lenses, if present and easy to do. Continue rinsing. P501: Dispose of contents/ container to an approved waste disposal plant.
Signal Word	Danger
Storage class	10 – 13 Other liquids and solids
WGK	WGK 1 slightly hazardous to water
Disposal	14 Inorganic salts: Container I. Neutral solutions of the these salts: Container D. Before placing in Container D, check the pH with pH-Universal indicator strips (Item No. 109535).

Storage and Shipping Information
Storage	Store at +2°C to +30°C.

Specifications
Assay (acidimetric)	99.0 – 103.0 %
Insoluble matter	≤ 0.01 %
pH-value (5 %; water, 25 °C)	9.5 – 10.5
Chloride (Cl)	≤ 0.001 %
Orthophosphate (PO₄)	≤ 0.1 %
Sulfate (SO₄)	≤ 0.005 %
Total nitrogen (N)	≤ 0.001 %
Fe (Iron)	≤ 0.0005 %
K (Potassium)	≤ 0.005 %
Heavy metals (as Pb)	≤ 0.0005 %
Corresponds to ACS, Reag. Ph Eur

Merck 106591 0500 Sodium diphosphate decahydrate for analysis EMSURE 500 GR.