Nomenclature
CAS number: 1340-26-7
Degener's indicator.
Description and references
Reaction product of concd H2SO4 and glacial acetic acid on phenol.
Properties
Yellowish-brown powder. Slightly sol in water;
sol in alc.Use
Has been employed as indicator, particularly for
mixtures of alkali hydroxides and carbonates; the yellow color changes
to red when hydroxide is neutralized, and again to yellow when carbonate
is fully dec by acid; was also used for determining alkalinity of
water. The indicator soln is prepd by digesting 1 g with 100 ml warm
alcohol and filtering after cooling; 2-3 drops used for 100 ml liquid.