Phenol red
IUPAC: 4-[3-(4-hydroxyphenyl)-1,1-dioxo-2,1lambda6-benzoxathiol-3-yl]phenol
| Formula / Notation | C19H14O5S |
|---|---|
| CAS Number | 143-74-8 |
| Molecular Weight | 354.4 |
| Appearance | Odorless, red solid; Available as pure compound, soluble monosodium salt, and dilute solutions; [CHEMINFO] |
| Also Known As | 4-[3-(4-hydroxyphenyl)-1,1-dioxo-2,1lambda6-benzoxathiol-3-yl]phenol; phenolsulfonphthalein; 143-74-8; Fenolipuna; Sulphonthal; Phenolsulphonphthalein; PSP (indicator); NSC-10459; DTXSID8022408; I6G9Y0J1OJ |
| Category | Indicators |
What is Phenol red?
Phenol red is 3H-2,1-Benzoxathiole 1,1-dioxide in which both of the hydrogens at position 3 have been substituted by 4-hydroxyphenyl groups. A pH indicator changing colour from yellow below pH 6.8 to bright pink above pH 8.2, it is commonly used as an indicator in cell cultures and in home swimming pool test kits. It is also used in the (now infrequently performed) phenolsulfonphthalein (PSP) test for estimation of overall blood flow through the kidney. It has a role as a diagnostic agent, an acid-base indicator and a two-colour indicator. It is a member of phenols, a 2,1-benzoxathiole, a sultone and an arenesulfonate ester.
Formula & Notation
IUPAC Name: 4-[3-(4-hydroxyphenyl)-1,1-dioxo-2,1lambda6-benzoxathiol-3-yl]phenol
Other Names / Synonyms: 4-[3-(4-hydroxyphenyl)-1,1-dioxo-2,1lambda6-benzoxathiol-3-yl]phenol; phenolsulfonphthalein; 143-74-8; Fenolipuna; Sulphonthal; Phenolsulphonphthalein; PSP (indicator); NSC-10459; DTXSID8022408; I6G9Y0J1OJ
Properties & Characteristics
Physical Data
| Property | Value |
|---|---|
| Molecular Weight | 354.4 |
| Appearance | Odorless, red solid; Available as pure compound, soluble monosodium salt, and dilute solutions; [CHEMINFO] |
Uses & Applications
Safety Information
Always consult the SDS/MSDS before handling any chemical. This information is for educational purposes only.
Key Facts
Frequently Asked Questions
Phenol red is 3H-2,1-Benzoxathiole 1,1-dioxide in which both of the hydrogens at position 3 have been substituted by 4-hydroxyphenyl groups. A pH indicator changing colour from yellow below pH 6.8 to bright pink above pH 8.2, it is commonly used as an indicator in cell cultures and in home swimming pool test kits. It is also used in the (now infrequently performed) phenolsulfonphthalein (PSP) test for estimation of overall blood flow through the kidney. It has a role as a diagnostic agent, an acid-base indicator and a two-colour indicator. It is a member of phenols, a 2,1-benzoxathiole, a sultone and an arenesulfonate ester.
Used as a pH indicator in acid-base titrations, analytical chemistry, and chemical education demonstrations.
May be irritant or toxic in concentrated form. Handle with care. Consult SDS before use.
The formula or notation for Phenol red is: C19H14O5S