This file is from Wikimedia Commons and may be used by other projects.
The description on its file description page there is shown below.
Summary
DescriptionBromothymol blue deprotonation.svg
English: Chemical equilibrium between the acid form (yellow, left) and the basic form (blue, right) of bromothymol blue. A proton (H+) is released and an internal rearrangement happens.
Français : Équilibre chimique entre la forme acide (jaune, à gauche) et la forme basique (bleue, à droite) du bleu de bromothymol. Un proton est libéré et un réarrangement interne se fait.
The person who associated a work with this deed has dedicated the work to the public domain by waiving all of their rights to the work worldwide under copyright law, including all related and neighboring rights, to the extent allowed by law. You can copy, modify, distribute and perform the work, even for commercial purposes, all without asking permission.
http://creativecommons.org/publicdomain/zero/1.0/deed.enCC0Creative Commons Zero, Public Domain Dedicationfalsefalse
Captions
Equilibrium between acid and basic forms of bromothymol blue.
Équilibre entre les formes acide et basique du bleu de bromothymol.