Date published: 2025-11-2

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Tropaeolin O sodium salt (CAS 547-57-9)

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Alternate Names:
Acid Orange 6; 2,4-Dihydroxyazobenzene-4′-sulfonic Acid Sodium Salt
CAS Number:
547-57-9
Molecular Weight:
316.27
Molecular Formula:
C12H9N2O5SNa
For Research Use Only. Not Intended for Diagnostic or Therapeutic Use.
* Refer to Certificate of Analysis for lot specific data.

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Tropaeolin O sodium salt is a dye used as a pH indicator in laboratory applications. It functions by changing color in response to changes in the acidity or alkalinity of a solution. At a low pH, the dye appears yellow, while at a high pH, it turns red. This property may be useful for visually determining the pH of a solution without the need for complex instrumentation. Tropaeolin O sodium salt achieves this through a reversible chemical reaction with hydrogen ions, leading to a shift in its absorption spectrum. Its mechanism of action involves the interaction of the dye molecules with the hydrogen ions present in the solution, resulting in a visible color change that corresponds to the pH level.

Ordering Information

Product NameCatalog #UNITPriceQtyFAVORITES

Tropaeolin O sodium salt, 25 g

sc-253803
25 g
$77.00