Buffer solution pH = 7,00 (25 °C), yellow-coloured

- 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 25ºC: 7,00 specification range: 6,99 - 7,01 uncertainty : ± 0,01 Composition per litre is 3,5 g Potassium dihydrogen phosphate and 12,5 g di-Sodium hydrogen phosphate. Contains preservative. 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: 7,12 5: 7,09 10: 7,06 15: 7,04 20: 7,02 25: 7,00 30: 6,99 35: 6,98 40: 6,97 45: 6,96 50: 6,96