What is the chemical formula for bromothymol blue?

C27H28Br2O5S
Bromothymol blue/Formula

Is thymol blue the same as 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 Bromothymol made of?

Bromothymol blue is a large compound with three benzene rings with two bromines (where the ‘bromo’ in the name comes from), a sulfur attached to three oxygens (a ‘thym’ group), and an alcohol (the -ol suffix). It is a powder, which makes it difficult to mix in with the sample to test for the pH.

How does bromothymol blue work?

Bromthymol blue changes color over a pH range from 6.0 (yellow) to 7.6 (blue). This makes bromothymol blue ideal for biology experiments to indicate photosynthetic activity (solution turns blue as plants use up carbon dioxide) or respiratory activity (solution turns yellow as carbon dioxide content increases).

What Colour does bromothymol blue turn in an acid?

yellow
Bromothymol blue is a pH indicator: it shows acids and bases by changing color. When you add acid, bromothymol blue turns yellow; when you add a base (like sodium sulfite), it turns blue. Green means neutral (like water).

Why is bromothymol blue used in titration?

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.

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 does it mean when bromothymol blue turns green?

The carbon dioxide can be used by organisms through photosynthesis, removing it from the atmosphere. Bromothymol blue (BMB) is an indicator dye that turns yellow in the presence of acid. BMB is blue when the pH is greater than 7.6, green when the pH is between 6-7.6, and yellow when the pH is less than 6.

Is BTB toxic?

Ingestion: May cause gastrointestinal irritation with nausea, vomiting and diarrhea. May be harmful if swallowed. Inhalation: May cause respiratory tract irritation. May be harmful if inhaled.

How to prepare bromothymol blue as pH indicator?

To prepare a solution for use as pH indicator, dissolve 0.10 g in 8.0 cm 3 N/50 NaOH and dilute with water to 250 cm 3. To prepare a solution for use as indicator in volumetric work, dissolve 0.1 g in 100 cm 3 of 50% (v/v) ethanol. Different colors of bromothymol blue at marked pH conditions.

How is the bromine in bromothymol blue synthesized?

Bromothymol blue is synthesized by addition of elemental bromine to thymol blue in a solution in glacial acetic acid. To prepare a solution for use as pH indicator, dissolve 0.10 g in 8.0 cm 3 N/50 NaOH and dilute with water to 250 cm 3.

What causes bromothymol blue to turn yellow?

Bromothymol blue (BMB) is an indicator dye which turns yellow when an acid is present. When carbon dioxide is added to the solution, carbonic acid is produced which lowers the solution’s pH.