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Buffer solution pH = 12,00 (20 °C) (di-Sodium hydrogen phosphate/Sodium hydroxide)

- Density: ~ 1,01 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: 12,00
specification range: 11,98 - 12,02
uncertainty : ± 0,01
Composition per litre is 10,6 g di-Sodium hydrogen phosphate and 3,10 g Sodium hydroxide.

Standard buffer solutions are prepared using gravimetric and volumetric procedures. The batch value is determined by measurement with a combination glass electrode against two-point calibration according to DIN 19268. This pH buffer solution is traceable to Standard Reference Material from NIST.
0: 12,58
5: 12,41
10: 12,26
15: 12,10
20: 12,00
25: 11,88
30: 11,72
35: 11,67
40: 11,54
45: 11,41
50: 11,33