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Cresol Purple

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Cresol Purple

Synonyms
m-Cresol Purple
CAS No.
2303-01-7
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Description

Chemical Name

Cresol Purple

Another name

m-Cresol Purple

CAS No.

2303-01-7

Molecular formula

C21H18O5S

EINECS No.

218-960-6

Molecular weight

382.43

Molecular Structure

Details

Appearance: Tiny brown crystal powder

pH change range:

1.2(pink)~2.8(yellow);

7.4(brownish yellow)~9.0(purple).

Max Absorption wavelength(nm):

λ1PH1.2   526-529;

λ2PH2.8   431-437;

λ3PH7.4   431-437;

λ4PH9.0   576-580.

Mass absorption coefficient  L/(cm·g)

αλ1PH1.2, Dry sample    80-94;

αλ2PH2.8, Dry sample    40-46;

αλ3, PH7.4, Dry sample     39-45;

αλ4PH9.0, Dry sample    75-86.

Solubility in Ethanol: Pass

Loss on drying: 1.0% max.

Main Application

A sulfonylurea indicator, used as pH indicator.

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