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| Xylenol orange | |
|---|---|
 |
|
| IUPAC name |
3,3′-Bis[N,N-bis(carboxymethyl)aminomethyl]-o-
cresolsulfonephthalein tetrasodium salt |
| Identifiers | |
| CAS number | 1611-35-4  ,3618-43-7 (tetrasodium salt) |
| EC-number | 216-553-8 |
| Properties | |
| Molecular formula | C31H32N2O13S |
| Molar mass | 672.67 g/mol |
| Melting point |
195 °C (368 K) |
| Solubility in water | 200 mg/mL |
| Hazards | |
| EU Index | not listed |
| R-phrases | R10, R20, R21, R22, R36, R38 |
| S-phrases | (S1/2), S26, S27, S28, S62, S63 |
| NFPA 704 |
 1
2
2
|
| Flash point | Greater than 93 °C (200 °F) |
| (what is this?) (verify) Except where noted otherwise, data are given for materials in their standard state (at 25 °C, 100 kPa) |
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| Infobox references | |
Xylenol orange is an organic reagent, most commonly used as a tetrasodium salt as an indicator for metal titrations. Historically, commercial preparations of it have been notoriously impure, sometimes consisting of as little as 20% xylenol orange, and containing large amounts of semi-xylenol orange and iminodiacetic acid. Purities as high as 90% are now available.
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