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Buffer solution pH = 4,00 (25 °C), red-coloured

- Density: ~ 1,00 g/cm3r- Solub. in water: (20 ºC): miscibler- Tariff number: 3822 00 00 00r- 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.rrSPECIFICATIONSrpH at 25ºC: 4,00rspecification range: 3,99 - 4,01runcertainty : ± 0,01rComposition per litre is 10,2 g Potassium hydrogen phthalate. Contains preservative. rrStandard 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. r0: 4,00r5: 4,00r10: 4,00r15: 4,00r20: 4,00r25: 4,00r30: 4,01r35: 4,01r40: 4,02r45: 4,02r50: 4,03r