Products / pH Indicators

1-NAPHTHOLBENZEIN Print Download

C.A.S. No. 145-50-6
M.F. C27H18O2
M.W. 374.44 gm/mole

Specifications:

Solubility 0.1% ( in acetic perchloric acid) Almost clear solution
Absorption maximum (in acetic perchloric acid)?max 622-626 nm
Absorptivity 1%/1cm in acetic perchloric acid)(on dried substance)Absorptivity 1%/1cm in acetic perchloric acid)(on dried substance) >640
Loss on drying (110oC) <7%

Chemical Name

4-(alpha-(4-Hydroxy-1-naphthyl)benzylidene)naphthalen-1(4H)-one

InChI Key

VDDWRTZCUJCDJM-SOYKGTTHSA-N

Solubility

Insoluble in water; soluble in ethanol, methanol, acetic acid, acetone, benzene.

Product Description:

a-Naphtholbenzein has been used as indicator during sequential injection analysis technique done for acid-base titrations. General description. a-Naphtholbenzein is a dye generally used during acid-base titration method.

Applications:

A 0,2% w/v solution of 1-naphtholbenzein in anhydrous glacial acetic acid complies the following test. Add 0,25ml to 50ml of anhydrous glavcial acetic acid. Not more than 0,05ml of 0.1M perchloric acid is required to change the color of the solution from brownish yellow to green.

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