methyl red

American  

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.

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Etymology

Origin of methyl red

First recorded in 1905–10

Example Sentences

See Examples For:

methyl red

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

From Organic Syntheses by Conant, James Bryant

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

From Organic Syntheses by Conant, James Bryant

The methyl alcohol may be recovered with very little loss by distillation; it is, however, impracticable to attempt to recover any methyl red from the residue, owing to the tarry nature of the by-product.

From Organic Syntheses by Conant, James Bryant

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.

From Organic Syntheses by Conant, James Bryant

The hydrochloride of methyl red is only sparingly soluble in cold water, and is apt to separate in blue needles if the acidity is not sufficiently reduced.

From Organic Syntheses by Conant, James Bryant