Products / pH Indicators

PAR INDICATOR MONOSODIUM SALT Print Download

C.A.S. No. 16593-81-0
M.W. 255.21gm/mole

Specifications:

Dye Content (by Spectrophotometry) >90%
Solubility 0.1 % (Dist. water) Clear solution
Absorption Maximum (in Dist. water) ?max 411-413nm
Absorptivity (A1%/1cm in Dist. water ,at ?max) >1300
Loss on drying (110°C) <8%
Suitability as metal indicator Passes test

Chemical Name

4-(2-Pyridylazo)resorcinol

InChI Key

VLCAILLZPUINNF-LCYFTJDESA-N

Solubility

Soluble in acetone, alcohol, and dilute aqueous alkali. Soluble in water.

Product Description:

1-(2-Pyridylazo)-2-resorcinol (PAR), an orange colored dye, is commonly used as an acid-base indicator. It can form chelates with metal ions, which makes it a valuable indicator in complexometric titrations. 1-(2-Pyridylazo)-2-resorcinol is an indicator in complexometry and a reagent for the extraction and spectrophotometric determination of many transition metals.

Applications:

4-(2-Pyridylazo)resorcinol monosodium salt is a useful indicator in complexometry, as well as a reagent for the extraction and spectrophotometric determination of many transition compounds. It is a highly selective and sensitive reagent for cobalt and iron. 4-(2-Pyridylazo)resorcinol monosodium salt is also a useful reagent for selective determination of trace level chrome(III) by ion-pair reversed-phase high-performance liquid chromatography.

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