methyl red

noun

Chemistry.

1. a water-insoluble solid occurring as a dark-red powder or violet crystals, C 1 5 H 1 5 N 3 O 2 , used chiefly as an acid-base indicator.

Word History and Origins

Origin of methyl red¹

First recorded in 1905–10

Example Sentences

The total yield of pure methyl red is 790—840 g.

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When the methyl red is crystallized from toluene, it sometimes separates in the form of bright-red lumps, probably on account of too rapid crystallization.

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In the meantime a second conical flask containing 1250 cc. of toluene is attached to the funnel, and a new charge of 150 g. of crude methyl red is placed in the paper.

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The crystals of methyl red are filtered off and washed with a little toluene.

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The watery mother liquors from the crude methyl red are rendered alkaline with sodium hydroxide and distilled until no more dimethylaniline passes over.

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