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

Tint with methyl-orange and titrate with semi-normal ammonia.

From Project Gutenberg

Disconnect the receiver, and tint its contents with methyl orange.

From Project Gutenberg

Tint with methyl orange, and run in from an ordinary burette normal solution of sulphuric acid until a pink tint is got.

From Project Gutenberg

The diluted solution is acid in reaction toward litmus and phenolphthalein and alkaline toward methyl orange.

From Project Gutenberg

Thus blue litmus is changed to red, and yellow methyl orange is changed to red.

From Project Gutenberg