A white or pale-yellow crystalline powder, C20H14O4, utilized as an acid-base indicator, to make dyes, and previously in medication as a laxative. Due to the toxicity, its no longer used in non-prescription laxatives.
A quinone derivative made use of as a pH signal, and once used as a laxative
See under Phthalein.
a white or yellowish white crystalline material produced from phthalic acid and phenol. Its answer in alkalies is brilliant red, it is decolorized by acids, so when this effect is exceedingly fragile it really is made use of as an indication.
A white crystalline mixture, C20H14O4, created by heating a combination of phthalic anhydrid and phenol with a dehydrating representative, as stannic chlorid or sulphuric acid. The dilute alcoholic solution is a lot used as an indicator in titrating. It can he used in combination with weak or strong acids and powerful basics. It melts at 250–253° C.
a laxative found in numerous arrangements under numerous trade brands; in addition made use of as an acid-base indicator in titrations concerning poor acids and powerful basics because it is brilliant red at high alkalinity and colorless below pH 8
A white or yellowish-white crystalline compound, C20H14O4, created by condensation associated with the anhydride of phthalic acid and phenol. Its option in alkalies is brilliant purple, it is decolorized by acids. This effect, being very fragile, is used as an indicator. It really is often utilized as a laxative in veterinary medication.