1.15231
2-[4-(2-Hydroxyethyl)-1-piperazinyl]-ethanesulfonic acid sodium salt
pKa (20 °C)7.55, ≥99% dry basis (perchloric acid titration)
Synonym(s):
2-[4-(2-Hydroxyethyl)-1-piperazinyl]-ethanesulfonic acid sodium salt
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About This Item
Empirical Formula (Hill Notation):
C8H17N2NaO4S
CAS Number:
Molecular Weight:
260.29
UNSPSC Code:
12161703
EC Index Number:
278-169-7
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![2-[4-(2-Hydroxyethyl)-1-piperazinyl]-ethanesulfonic acid Buffer substance HEPES EMPROVE® EXPERT](/deepweb/assets/sigmaaldrich/product/images/351/602/c50c8b6f-6bcd-4751-9064-2cc5cb47d00f/640/c50c8b6f-6bcd-4751-9064-2cc5cb47d00f.jpg)
assay
≥99% dry basis (perchloric acid titration)
form
solid
pKa (20 °C)
7.55
storage temp.
2-30°C
InChI
1S/C8H18N2O4S.Na/c11-7-5-9-1-3-10(4-2-9)6-8-15(12,13)14;/h11H,1-8H2,(H,12,13,14);/q;+1/p-1
InChI key
RDZTWEVXRGYCFV-UHFFFAOYSA-M
General description
buffer substance HEPES-Na
Analysis Note
Assay (perchloric acid titration, calculated on dried substance): ≥ 99
Identity (IR-spectrum): passes test
UV-Absorption (250 nm, 20 g/l, 1 cm, water): ≤ 0.06
Chloride (Cl): ≤ 0.005 %
Sulfate (SO₄): ≤ 0.005 %
Heavy metals (as Pb): ≤ 0.0005 %
Loss on Drying (105 °C): ≤ 6.0
Biological buffer, pKa at 20 °C: 7.55
Identity (IR-spectrum): passes test
UV-Absorption (250 nm, 20 g/l, 1 cm, water): ≤ 0.06
Chloride (Cl): ≤ 0.005 %
Sulfate (SO₄): ≤ 0.005 %
Heavy metals (as Pb): ≤ 0.0005 %
Loss on Drying (105 °C): ≤ 6.0
Biological buffer, pKa at 20 °C: 7.55
Storage Class
13 - Non Combustible Solids
wgk_germany
WGK 3
flash_point_c
Not applicable
Certificates of Analysis (COA)
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