methyl orange

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meth′yl or′ange

an orange-yellow, slightly water-soluble powder, C14H14N3NaO3S, used chiefly as an acid-base indicator.
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Noun1.methyl orange - an azo dye used as an acid-base indicator; used for titrations involving weak bases
acid-base indicator - an indicator that changes color on going from acidic to basic solutions
azo dye - any dye containing one or more azo groups
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References in periodicals archive ?
Molecular [FORMULA NOT REPRODUCIBLE IN ASCII] structure Synonyms Gold orange, Helianthine, Orange III Molecular formula [C.sub.14][H.sub.14][N.sub.3]Na[O.sub.3]S Molar mass 327.34 g [mol.sup.-1] CI number 13025 CAS number 547-58-0 Type Anionic LD 50 (oral, rat) 60 mg [kg.sup.-1] TABLE 2: Kinetic model parameters and constants with statistical data.
Then 25 ml of each mixture is dosed with HCl solution (0.1N) in presence of helianthine by NaHC[O.sub.3] and [Na.sub.2]C[O.sub.3] or phenolphthalein by NaOH and [C.sub.2][H.sub.5]ONa.