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Cresol Red
Chemical Name |
Cresol Red |
Another name |
o-Cresolsulfonphthalein; 4,4'-(3H-2,1-Benzoxathiol-3-ylidene)bis(2-methylphenol) S,S-dioxide |
CAS No. |
1733-12-6 |
Molecular formula |
C21H18O5S |
EINECS No. |
217-064-2 |
Molecular weight |
382.43 |
Molecular Structure |
|
Details |
Appearance: brownish red crystal Assay: 80% min. Max Absorption wavelength, λ1(PH6.5): 432~436 nm λ2(PH8.5): 571~574 nm Mass absorption coefficient L/(cm·g) α1〔λ1(PH6.5)〕49-67 , α2〔λ2(PH8.5)〕100-132 Solubility in Ethanol: Pass Loss on drying: 0.2% max Residue on ignition (sulfate):3.0%max |
Main Application |
A sulfonylurea indicator, used as pH indicator. |
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