Sodium hydroxide solution, 0,25 mol/l - 0,25 N volumetric solution, Molar mass (M) 40,01 g/mol, Density (D) 1,01 g/cm³, Boiling point (bp) 100 °C, CAS No. [1310-73-2], UN-Nr. 1824, EG-Nr. 215-185-5, Empirical formula NaOH