H7523
Sigma

HEPES

SigmaUltra, pH 5.0-6.5 (20 °C, 1 M in H₂O), ≥99.5% (titration)

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Synonym

4-(2-Hydroxyethyl)piperazine-1-ethanesulfonic acid

N-(2-Hydroxyethyl)piperazine-N′-(2-ethanesulfonic acid)

Molecular Formula

C₈H₁₈N₂O₄S

Molecular Weight

238.30

CAS Number

7365-45-9

Beilstein Registry Number

883043

MDL number

MFCD00006158

PubChem Substance ID

24895796

EG/EC Number

230-907-9

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Descriptions

Enhanced Quality Profile

The Enhanced Quality Profile characterizes an individual product's quality traits in a multilevel system to assure that a given product meets the quality requirements of our customers.

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

5.0-6.5 (20 °C, 1 M in H₂O)

useful pH range

6.8 - 8.2

pKa (25 °C)

7.5

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.

A1M/260, H₂O ≤0.045

A1M/280, H₂O ≤0.035

References

Merck

Merck 13,4672

Beilstein

Beil. 23,V,2,379

Safety

WGK Germany

RTECS

TL6809000

Related Categories

... Biological Buffers > Buffers A to Z

... Biological Buffers > Good's Buffers

... Biological Buffers > SigmaUltra Buffers

FT-IR Raman

H7523 - Product Information Sheet (15kb)

MSDS

Specification Sheet

Certificate of Analysis

Certificate of Origin

More Information

HEPES

SigmaUltra, pH 5.0-6.5 (20 °C, 1 M in H2O), ≥99.5% (titration)

SigmaUltra, pH 5.0-6.5 (20 °C, 1 M in H₂O), ≥99.5% (titration)