Buffer solution pH = 4,00 (25 °C), red-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: 4,00
specification range: 3,99 - 4,01
uncertainty : ± 0,01
Composition per litre is 10,2 g Potassium hydrogen phthalate. 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: 4,00
5: 4,00
10: 4,00
15: 4,00
20: 4,00
25: 4,00
30: 4,01
35: 4,01
40: 4,02
45: 4,02
50: 4,03