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Chlorophenol Red sodium salt is used in the standard samples to indicate pH. A stain used to detect chlorine dioxide in drinking water.
Afsaneh Safavi,; Norouz Maleki,; Mozhgan Bagheri. Modification of chemical performance of dopants in xerogel films with entrapped ionic liquid. J. Mater. Chem. 2007, 17 1674-1681o.
Acid-base indicator; approx. pH 5.2 - 7.0.