Orange Powder Xylenol Orange Sodium Salt CAS 63721-83-5 Acid-Base Indicators
Xylenol orange is a triphenylmethane colorimetric agent with a molecular formula of C₃₁H₃₂N₂O₁₃S and a molecular weight of 672.66. It is a lustrous, reddish-brown crystalline powder. It is highly deliquescent. Its sodium salt is readily soluble in water but insoluble in alcohol and ethe. Due to its o-cresolphthalein structure, the pH of the solution significantly affects its color development. At pH > 6.3, the solution appears red, while at pH < 6.3, it appears yellow. It forms red-purple complexes with most metal ions.
| Item | Value |
|---|---|
| Product Name | Xylenol Orange sodium salt |
| CAS | 63721-83-5 |
| MF | C31H31N2NaO13S |
| MW | 694.64 |
| EINECS | 216-553-8 |
| Appearance | orange powder |
When used as a metal indicator in complexometric titration, it is suitable for acidic solutions with a pH value less than 6 and is used to determine metal ions such as bismuth, thorium, scandium, lead, zinc, lanthanum, cadmium and mercury.
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