Hidroxid de sodiu pelete, pentru analiza; EMSURE® ISO MERCK GERMANIA Caracteristicile calitative sunt cele prezentate in catalogul Merck la Codul 1064981000 Hill Formula HNaO Chemical formula NaOH Molar Mass 40.00 g/mol HS Code 2815 11 00 Density 2.13 g/cm3 (20 °C) Melting Point 319 - 322 °C pH value >14 (100 g/l, H₂O, 20 °C) Solubility 1090 g/l Assay (acidimetric,NaOH) ≥ 99.0 % Carbonate (as Na₂CO₃) ≤ 1.0 % Chloride (Cl) ≤ 0.012 % Phosphate (PO₄) ≤ 0.0005 % Silicate (SiO₂) ≤ 0.001 % Sulfate (SO₄) ≤ 0.010 % Total nitrogen (N) ≤ 0.0003 % Heavy metals (as Pb) ≤ 0.0005 % Al (Aluminium) ≤ 0.0005 % As (Arsenic) ≤ 0.0001 % Ca (Calcium) ≤ 0.0005 % Cu (Copper) ≤ 0.0002 % Fe (Iron) ≤ 0.0005 % K (Potassium) ≤ 0.05 Mg (Magnesium) ≤ 0.0005 % Ni (Nickel) ≤ 0.00025 % Pb (Lead) ≤ 0.0005 % Zn (Zinc) ≤ 0.001 %