H7523
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H7523
Sigma
HEPES
SigmaUltra, pH 5.0-6.5 (20 °C, 1 M in H2O), ≥99.5% (titration)
| Synonym: | 4-(2-Hydroxyethyl)piperazine-1-ethanesulfonic acid, N-(2-Hydroxyethyl)piperazine-N′-(2-ethanesulfonic acid) |
| CAS Number: | 7365-45-9 |
| Linear Formula: | C8H18N2O4S |
| Molecular Weight: | 238.30 |
| Beilstein Registry Number: | 883043 |
| EC Number: | 230-907-9 |
| MDL number: | MFCD00006158 |
| PubChem Substance ID: | 24895796 |
Description
| Other Notes | Easily compare specifications for HEPES products with the HEPES specification table. |
Properties
| grade | SigmaUltra |
| assay | ≥99.5% (titration) |
| total impurities | Insoluble matter, passes filter test |
| ign. residue (900°C) | ≤0.1% (as SO4) |
| loss | ≤1.0% loss on drying, 110°C |
| pH | 5.0-6.5 (20 °C, 1 M in H2O) |
| useful pH range | 6.8 - 8.2 |
| pKa (25 °C) | 7.5 |
| EQP level | Elite |
| solubility | H2O: 1 M at 20 °C, clear, colorless |
| anion traces | chloride (Cl-): ≤0.05% |
| cation traces | Al: ≤0.0005% |
| As: ≤0.0001% | |
| Ba: ≤0.0005% | |
| Bi: ≤0.0005% | |
| Ca: ≤0.001% | |
| Cd: ≤0.0005% | |
| Co: ≤0.0005% | |
| Cr: ≤0.0005% | |
| Cu: ≤0.0005% | |
| Fe: ≤0.0005% | |
| K: ≤0.005% | |
| Li: ≤0.0005% | |
| Mg: ≤0.0005% | |
| Mn: ≤0.0005% | |
| Mo: ≤0.0005% | |
| Na: ≤0.005% | |
| Ni: ≤0.0005% | |
| Pb: ≤0.0005% | |
| Sr: ≤0.0005% | |
| Zn: ≤0.0005% | |
| abs. | A |
| A |
Safety
| Personal Protective Equipment | Eyeshields, Gloves, type N95 (US), type P1 (EN143) respirator filter |
| WGK Germany | 1 |
| RTECS | TL6809000 |
References
| Merck | Merck 13,4672 |
| Beilstein | Beil. 23,V,2,379 |
