- Density: ~ 1,00 g/cm3 - Solub. in water: (20 ºC): miscible - Tariff number: 3822 00 00 00 - Applications: This reference material is intended for the calibration of pH meters and electrodes used for pH measurement or as a control sample for measuring the pH value. SPECIFICATIONS pH at 20 ºC: 1,00 uncertainty ± 0,01 Composition per litre is 0,2 g Glycine, 0,1 g Sodium chloride and about 13,1 g Hydrochloric acid concentrated. Standard buffer solutions are prepared using gravimetric and volumetric procedures. The batch value is determined by measurement with a combination glass electrode against five-point calibration according to DIN 19268. This pH buffer solution is traceable to Standard Reference Material from NIST. 0: 0,96 5: 0,99 10: 0,99 15: 0,99 20: 1,00 25: 1,01 30: 1,01 35: 1,01 40: 1,01 45: 1,01 50: 1,01