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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.


Etymology

Origin of methyl orange

First recorded in 1880–85

Example Sentences

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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

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

From Textbooks Feb. 14, 2019

About 7-8 grammes of the sample are dissolved in water, and made up to 100 c.c., and the total alkalinity determined by titrating 20 c.c. with N/1 acid, using methyl orange as indicator.

From The Handbook of Soap Manufacture by Simmons, W. H.

Methyl orange Red Yellow Very slightly acid Phenolphthalein Colorless Red Acid Litmus Red Blue Acid It may be further stated that methyl orange at the neutral point is orange in color.

From Soap-Making Manual A Practical Handbook on the Raw Materials, Their Manipulation, Analysis and Control in the Modern Soap Plant. by Thomssen, E. G.

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