English En

Buffer solution pH = 7,00 (20 °C) (Potassium dihydrogen phosphate/di-Sodium hydrogen phosphate)

- Density: 1,01 g/cm3
- Solub. in water: (20 ºC): miscible
- Melting point: -5 ºC
- Boiling point: 109 ºC
- 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: 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: 7,13
5: 7,07
10: 7,05
15: 7,02
20: 7,00
25: 6,98
30: 6,98
35: 6,96
40: 6,95
45: 6,95
50: 6,95