TCI E0054, bearing CAS number 2313-87-3, is 4-Ethoxychrysoidine Hydrochloride, a coloured azo compound supplied in its hydrochloride salt form. In the analytical chemistry laboratory, this material is known as a redox indicator used to mark the end point of a titration, particularly in titrations involving strong oxidising agents such as bromate and bromine. Its role is a highly practical one: instead of requiring potentiometric instrumentation, the analyst simply observes the colour change of the solution to determine when the titration reaction has reached stoichiometric completion.
The principal characteristics that make this compound a preferred choice are its sensitivity toward oxidising agents together with a colour change that is decisive and easy to observe with the naked eye. The azo group within its chromophoric structure is irreversibly oxidised once an excess of oxidant is present in the solution, so that the colour of the solution fades or changes at the titration end point. The hydrochloride salt form makes the compound readily soluble in aqueous media as well as in water–alcohol mixtures, so that preparation of the indicator solution becomes straightforward. The quantity of indicator required per titration is also very small, usually only a few drops of a dilute solution.
In Indonesian laboratories, this reagent finds its place in analytical work built around classical wet-chemical titration rather than instrumental determination. It suits teaching and routine quality-control settings where visual end-point detection remains the working method, where a titration can be completed with standard glassware, and where a clear, unambiguous colour transition allows results to be read reliably by different analysts without dedicated electrochemical equipment.
TCI brochures (PDF)
- Titration Reagents and TLC Stains 2026-05-07 · p. 3
- Bromatometric titration: the compound serves as a visual redox indicator whose irreversible azo oxidation signals the exact moment excess bromate is present in solution.
- Titrations with bromine: the decisive colour change marks the stoichiometric end point clearly, allowing the analyst to stop the titration without any potentiometric instrument.
- Routine quality-control analysis: the indicator requires only a few drops of dilute solution per determination, keeping classical titration procedures simple, economical and reproducible between operators.
- Analytical teaching laboratories: the sharp, easily observed colour transition makes it well suited to demonstrating redox end-point detection to students using ordinary titration glassware.
- Aqueous and hydroalcoholic titration systems: the hydrochloride salt dissolves readily in water and water–alcohol mixtures, so indicator solutions are prepared quickly and without special solvents.
| Brand | TCI |
|---|---|
| CAS number | 2313-87-3 |
| Molecular formula | — |
| Purity | — |
| Category | Analytical Chemistry > Analytical Reagents > Titration Reagents |
| Pack sizes | available in standard TCI catalogue pack sizes; please confirm the packaging option required |
| Physical form | coloured azo compound supplied as the hydrochloride salt |
| Storage | — |
- Chemical name: 4-Ethoxychrysoidine Hydrochloride
Store the reagent in its original tightly closed container, kept in a cool, dry and well-ventilated place away from direct sunlight and from oxidising agents, since the azo chromophore is oxidised irreversibly. Amber glass or the manufacturer's original packaging is suitable for both the solid and any prepared indicator solutions, which should be clearly labelled with the preparation date. Handle the material in a well-ventilated area or fume hood, wearing a laboratory coat, safety goggles and chemical-resistant gloves. Avoid raising dust when weighing, close the container immediately after use, and consult the manufacturer's safety data sheet before handling and prior to disposal of residues.
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