What is thymol blue used for?
What is thymol blue used for?
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.
Is thymol blue a good indicator?
An aqueous solution of acetic acid (ethanoic acid), CH3COOH(aq), is a weak acid. An aqueous solution of sodium hydroxide, NaOH(aq), is a strong base. Consider thymol blue (pH range 8.0 – 9.6) or phenolphthalein (8.3 – 10.0) as suitable indicators.
What is the chemical formula for thymol blue?
C27H30O5S
Thymol blue/Formula
What color is thymol blue in a base?
yellow
| Indicator | pH Range | color in base form |
|---|---|---|
| Thymol Blue | 1.2 – 2.8 | yellow |
| Methyl Orange | 3.1 – 4.4 | orange |
| Methyl Red | 4.2 – 6.3 | yellow |
| Thymol Blue | 8.0 – 9.6 | blue |
What is the pH range of thymol blue?
| Indicator | pH Range | Acid |
|---|---|---|
| 27 Phenolphthalein | 8-10 | colourless |
| 34 Thymol blue (1st range) | 1.2-2.8 | red |
| 34.1 Thymol blue (2nd range) | 8.0-9.6 | yellow |
| 33 Thymolphthalein | 9.4-10.6 | colourless |
Is thymol blue carcinogenic?
Not available. Carcinogenicity: CAS# 76-61-9: Not listed by ACGIH, IARC, NTP, or CA Prop 65.
Is Bromothymol Blue same as thymol blue?
Bromothymol blue is synthesized by addition of elemental bromine to thymol blue in a solution in glacial acetic acid.
Why does thymol blue have two color transitions?
Explanation: Thymol blue changes colour at two different pH ranges. The first colour change is from red to yellow at pH 1.2–2.8, and the second is from yellow to blue at pH 8.0 – 9.6. At pH 10, the indicator is past its second colour change, so the solution will be blue .
Is thymol blue flammable?
Fire hazard : Highly flammable liquid and vapor. Explosion hazard : May form flammable/explosive vapor-air mixture.
Is bromophenol blue flammable?
pH: No data. Appearance and Odor: 9.1 Information on Basic Physical and Chemical Properties Flammability (solid, gas): No data available. Multi-region format Page 4 07/13/2017 Revision: Page: 4 of 5 Bromophenol Blue SAFETY DATA SHEET 01/17/2014 Supersedes Revision: Specific Gravity (Water = 1):
