thymol blue การใช้

• Sucrose fermentation produces acid, which converts the colour of bromothymol blue or thymol blue.
• The general carbon skeleton of bromothymol blue is common to many indicators including chlorophenol red, thymol blue, and bromocresol green.
• "' Thymol blue "'( thymolsulphonephthalein ) is a brownish-green or reddish-brown crystalline powder that is used as a pH indicator.
• A universal indicator is typically composed of water, propan-1-ol, phenolphthalein sodium salt, sodium hydroxide, methyl red, bromothymol blue monosodium salt, and thymol blue monosodium salt.
• If the base is off the scale, i . e . a pH of > 13.5, and the acid has a pH > 5.5, then an Thymol Blue indicator may be used.
• Several indicators share a similar structure to phenol red, including bromothymol blue, thymol blue, bromocresol purple, thymolphthalein, and phenolphthalein . ( A table of other common chemical indicators is available in the article on pH indicators .)