HEPES

HEPES

4-(2-Hydroxyethyl)-1-piperazine-ethane sulfonic acid
C8H18N2O4S

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CAS 7365-45-9
Form: White crystalline powder
Formula: C8H18N2O4S
Formula weight: 238.30
Assay: > 99 %
Solubility (1M, H2O): Clear solution
pKa (20 °C): 7.35 - 7.69
Loss on drying (104°C, 4h): < 0.5 %
Residue on ignition: < 0.1 %
pH (1%, H2O): 4.8 - 5.6
A260 (1M, H2O): < 0.05
A280 (1M, H2O): < 0.05
Heavy metals (as Pb): < 5ppm
Fe: < 5 ppm
Storage: Room temperature. Protect from moisture and light.
Stability: Stable at least 2 years at RT.

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