Answered: Alizarin yellow R, Ka = 7.9 x 1012, is…

Alizarin yellow R, Ka = 7.9 x 1012, is yellow in its protonated form (HX) and red in its ionized form (X). At what pH will alizarin yellow R be a perfect orange color?

Organic Chemistry

9th Edition

ISBN:9781305080485

Author:John E. McMurry

Publisher:John E. McMurry

Chapter20: Carboxylic Acids And Nitriles

Section20.SE: Something Extra

Problem 39AP: Calculate the Ka's for the following acids: (a) Citric acid, pKa = 3.14 (b) Tartaric acid, pKa =...

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Question

Alizarin yellow R, Ka = 7.9 x 10-1 , is yellow in its protonated form (HX) and red in its
ionized form (X). At what pH will alizarin yellow R be a perfect orange color?

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