methyl orange

noun

Chemistry.

1. an orange-yellow, slightly water-soluble powder, C 1 4 H 1 4 N 3 NaO 3 S, used chiefly as an acid-base indicator.

Word History and Origins

Origin of methyl orange¹

First recorded in 1880–85

Example Sentences

A few drops of starch solution are then added, and when the blue colour has nearly vanished a drop or two of methyl orange makes the end reaction very sharp.

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The barium carbonate is added through the funnel at the top of the tank mixed with a little water and the lye tested until it is neutral to methyl orange indicator.

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Alkalinity of the Soluble Ash—Official Cool the filtrate from 9 and titrate with N/10 hydrochloric acid, using methyl orange as an indicator.

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The constitution of methyl orange follows from the fact that on reduction by stannous chloride in hydrochloric acid solution it yields sulphanilic acid and para-aminodimethyl aniline.

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Total alkali is estimated by dissolving 2 grammes in distilled water, and titrating when cold, with N/1 acid, using methyl orange as indicator.

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