methyl orange

American  

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.

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Etymology

Origin of methyl orange

First recorded in 1880–85

Example Sentences

See Examples For:

methyl orange

The anion of methyl orange, In−, is yellow, and the nonionized form, HIn, is red.

From Textbooks ● Feb. 14, 2019

When we add acid to a solution of methyl orange, the increased hydronium ion concentration shifts the equilibrium toward the nonionized red form, in accordance with Le Châtelier’s principle.

From Textbooks ● Feb. 14, 2019

The equilibrium in a solution of the acid-base indicator methyl orange, a weak acid, can be represented by an equation in which we use HIn as a simple representation for the complex methyl orange molecule:

From Textbooks ● Feb. 14, 2019

Pour over the carbonate in each beaker about 80 cc. of water, stir until solution is complete, and add two drops of methyl orange solution.

From An Introductory Course of Quantitative Chemical Analysis With Explanatory Notes by Henry P. Talbot

Of the common indicators methyl orange is the most sensitive toward alkalies and phenolphthalein toward acids; the others occupy intermediate positions.

From An Introductory Course of Quantitative Chemical Analysis With Explanatory Notes by Henry P. Talbot