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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