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Cresol Red

Cresol Red

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Synonyms:
o-Cresolsulfonphthalein; 4,4'-(3H-2,1-Benzoxathiol-3-ylidene)bis(2-methylphenol) S,S-dioxide
CAS No.:
1733-12-6
数量
-
+
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0
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1
keyword:
Cresol Red
Description
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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)

α1λ1(PH6.5)49-67 ,

α2λ2(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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