C8085
Sigma

CAPSO

SigmaUltra, pH 2.0-4.0 (20 °C, 0.5 M in H₂O), ≥99.0% anhydrous basis (TSOD, titration)

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Synonym

3-(Cyclohexylamino)-2-hydroxy-1-propanesulfonic acid

CAPSO Free Acid

Molecular Formula

C₉H₁₉NO₄S

Molecular Weight

237.32

CAS Number

73463-39-5

Beilstein Registry Number

5939234

MDL number

MFCD00041778

PubChem Substance ID

24893021

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Descriptions

Legal Information

U.S. Patent No. 4,169,950.

Properties

grade

SigmaUltra

assay

≥99.0% anhydrous basis (CAPSO, titration)

≥99.0% anhydrous basis (TSOD, titration)

total impurities

≤0.0005% Phosphorus (P)

≤0.1% Insoluble matter

≤1.0% (Karl Fischer)

ign. residue

≤0.1%

2.0-4.0 (20 °C, 0.5 M in H₂O)

useful pH range

8.9 - 10.3

pKa (25 °C)

9.6

solubility

H₂O: 0.5 M at 20 °C, clear, colorless

anion traces

chloride (Cl^-): ≤0.05%

sulfate (SO₄^2-): ≤0.05%

cation traces

Al: ≤0.0005%

Ca: ≤0.0005%

Cu: ≤0.0005%

Fe: ≤0.0005%

K: ≤0.005%

Mg: ≤0.0005%

NH₄⁺: ≤0.05%

Na: ≤0.005%

Pb: ≤0.001%

Zn: ≤0.0005%

abs.

A0.5M/260, H₂O ≤0.05

A0.5M/280, H₂O ≤0.05

Safety

Safety Statements

22-24/25

WGK Germany

Related Categories

... Biological Buffers > Buffers A to Z

... Biological Buffers > Good's Buffers

... Biological Buffers > SigmaUltra Buffers

MSDS

Specification Sheet

Certificate of Analysis

Certificate of Origin

More Information

CAPSO

SigmaUltra, pH 2.0-4.0 (20 °C, 0.5 M in H2O), ≥99.0% anhydrous basis (TSOD, titration)

SigmaUltra, pH 2.0-4.0 (20 °C, 0.5 M in H₂O), ≥99.0% anhydrous basis (TSOD, titration)