THYMOL BLUE INDICATOR SOLUTION

Thymol blue (thymolsulfonephthalein) is a brownish-green or reddish-brown crystalline powder that is used as a pH indicator. It is insoluble in water but soluble in alcohol and dilute alkali solutions.

Thymol blue (thymolsulfonephthalein) is a brownish-green or reddish-brown crystalline powder that is used as a pH indicator. It is insoluble in water but soluble in alcohol and dilute alkali solutions. It transitions from red to yellow at pH 1.2–2.8 and from yellow to blue at pH 8.0–9.6.

Dosage

The invention relates to a method for preparing water-soluble thymol blue, which comprises the following steps of: dissolving sodium hydroxide in distilled water, slowly adding thymol blue into an alkaline solution, stirring at the temperature of between 70 and 90DEG C for 1.5 to 3 hours, filtering a mixture to obtain 

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