Bleu de bromothymol (C27H28Br2O5S) 4 gAlcool neutre 96 % vol. 200 mlAprès solubilisation ajouter:Eau sans CO2 200 mlSolution M d'hydroxyde de sodiumq.s.p. coloration bleu-vert (pH 7) 7,5 mlEau q.s.p.1 000 ml4.
- bromothymol blue (C27H28Br2O5S) 4 g- neutral ethanol, 96 % vol 200 mlDissolve and add:- water free of CO2 200 ml- 1 M sodium hydroxide solution sufficient to produce blue-green colour (pH 7) 7,5 ml approximately- water to1 000 ml4.