Products / pH Indicators

1-NAPHTHOLPHTHALEIN Print Download

C.A.S. No. 596-01-0
M.F. C28H18O4
M.W. 418.45gm/mole

Specifications:

Solubility 0.1 % (95% EtOH) Almost Clear solution
Absorption maximum (in 0.1N NaOH) ?max 650-654nm
Absorptivity 1%/1cm (in 0.1N NaOH) at ?max >650
Loss On Drying (110°C) <3%
Melting Point Range 236-240°C

Chemical Name

3,3-bis(4-hydroxynaphthalen-1-yl)-1,3-dihydro-2-benzofuran-1-one

InChI Key

HQHBAGKIEAOSNM-UHFFFAOYSA-N

Solubility

Practically insoluble in water; soluble in ethanol

Product Description:

a-Naphtholphthalein is used as a pH indicator and operates in the pH ranges between 7.3 and 8.7.

Applications:

Optical carbon dioxide sensor based on the colorimetric change of pH indicator a-naphtholphthalein with the internal reference fluorescent CIS/ZnS qua.It is also used in the designing of optical carbon dioxide sensor based on fluorescence intensity.a-Naphtholphthalein has been described for use in the design of an optical CO2 sensor based on the fluorescence intensity changes of Tetraphenylporphyrin (sc-215304) due to absorption changes of alpha-Naphtholphthalein embedded in a polymer.

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