Table of Contents
- 1 Is thymol blue a weak acid or base?
- 2 What is the difference between thymol blue and Bromothymol blue?
- 3 Why does thymol blue have two color transitions?
- 4 Why is phenolphthalein used as an indicator?
- 5 What is the color of the indicator thymol blue in a solution that has a pH of 11?
- 6 Why starch is used as indicator?
- 7 What does thymol blue mean?
- 8 What is bromothymol blue indicator?
Is thymol blue a weak acid or base?
Thymol blue is another weak acid that is used as an indicator. The fully protonated species (abbreviated H2Thy) is red, the monoprotonated species (HThy-) is yellow, and the fully deprotonated species (Thy2-) is blue.
Why is Bromothymol Blue a good indicator for titration?
Bromthymol blue changes color over a pH range from 6.0 (yellow) to 7.6 (blue). It is a good indicator of dissolved carbon dioxide (CO2) and other weakly acidic solutions. As the level of carbon dioxide or acid increases, the solution will gradually take on a yellow tint.
What is the difference between thymol blue and Bromothymol blue?
As a pH indicator, bromothymol blue, for example, would be useful between from about pH 6.0 to pH 7.6….
| Indicator | Thymol blue (second transition) |
|---|---|
| Low pH color | yellow |
| Transition pH range | 8.0–9.6 |
| High pH color | 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 |
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.
What Colour does thymol blue turn in a neutral 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. It transitions from red to yellow at pH 1.2–2.8 and from yellow to blue at pH 8.0–9.6.
Why is phenolphthalein used as an indicator?
A strong acid- strong base titration is performed using a phenolphthalein indicator. Phenolphtalein is chosen because it changes color in a pH range between 8.3 – 10. It will appear pink in basic solutions and clear in acidic solutions.
How is thymol blue made?
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 …
What is the color of the indicator thymol blue in a solution that has a pH of 11?
Highlight to reveal answers and explanations
| Questions | Answer | Links |
|---|---|---|
| 48 What is the color of the indicator thymol blue in a solution that has a pH of 11? (1) red (3) pink (2) blue (4) yellow | 2 | link |
| 49 Which formulas represent compounds that are isomers of each other? | 3 | link |
How do you make a thymol blue indicator solution?
Thymol Blue Indicator Solution: Dissolve 0.1 g of thymol blue in 2.15 ml of 0.1 M sodium hydroxide and 20 ml of ethanol (95 percent). After the solution is effected, add sufficient water to produce 100 ml.
Why starch is used as indicator?
Starch reacts with Iodine in the presence of Iodide ion to form an intensely colored blue complex, which is visible at very low concentrations of Iodine, making it a very good indicator in both direct and indirect lodometric titrations.
What does bromothymol blue indicator indicate?
Bromothymol blue is a pH indicator that determines if something is a weak base or acid. It is primarily used by applications that require the measuring of substances that have a fairly neutral pH.
What does thymol blue mean?
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 bromothymol blue an acid base indicator?
Bromthymol Blue is a dye used as an indicator in determining pH. Bromthymol blue is a weak acid. It can be in acid or base form , depending on the pH of the solution. This reagent is yellow in acidic solutions, blue in basic solutions and green in neutral solution.
What is bromothymol blue indicator?
Bromothymol blue is used as an indicator in many laboratory reactions. This is a dye that is considered to be pH sensitive.