Phenol,4,4'-(3h-2,1-benzoxathiol-3-ylidene)bis[2,5-dimethyl-,s,s-dioxide;1,4-DIMETHYL-5-HYDROXYBENZENESULFONPHTHALEIN;4,4-( 3H-2,1-benzoxathiol-3-ylidene)bis(2,5-dimethylphenol) S,S-dioxide;p-Xylenolsulphonephthalein;XYLENOL BLUE, INDICATOR GRADE;XYLENOL BLUE FREE ACID;P-XYLENOL BLUE INDICATOR;P-XYLENOL BLUE (0.04% IN CA. 95% ETHANOL) [FOR PH DETERMINATION]

CAS No.: 125-31-5

Molecular formula: C23H22O5S

Molecular weight: 410.48

 

Xylenol blue

Melting point 212 ° C (dec.)

Solubility Slightly soluble in water, soluble in ethanol

Form Powder

Acidity coefficient (pKa) 9.52 (at 25 ° C)

Color Dark brown

Acid-base indicator color change ph value range 1.2 (red) -2.8 (yellow) 8 (yellow) - 9.6 (blue)

Maximum wavelength (λmax) 424nm

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