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What is the pH range of Bromothymol blue?
6.0 to 7.6
The presence of one moderate electron-withdrawing group (bromine atom) and two moderate donating groups (alkyl substituents) are responsible for bromothymol blue’s active indication range from a pH of 6.0 to 7.6.
At what pH does Bromothymol blue change color?
to 7.6
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.
What is the range of color change for Bromothymol blue?
What Colour is Bromothymol blue at pH 7?
Bromothymol blue has a blue color when in basic conditions (pH over 7), a green color in neutral conditions (pH of 7), and a yellow color in acidic conditions (pH under 7).
Do indicators affect pH?
Normally, the indicator causes the color of the solution to change depending on the pH. Solutions with a pH value below 7.0 are considered acidic and solutions with pH value above 7.0 are basic (alkaline).
Why is thymol blue used as an indicator?
Some indicators change colour more than once over the pH range. Because it has two protons that can dissociate, thymol blue also has two pKa values: one at a pH of ½(1.2+2.8)=2.0 and the other at a pH of ½(8.0+9.6)=8.8.
Why does bromothymol blue change color when co2 is added?
Bromothymol blue (BMB) is an indicator dye that turns yellow in the presence of acid. When carbon dioxide is added to the solution, it creates carbonic acid, lowering the pH of the solution. 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.
What caused the color change in bromothymol blue?
What caused the bromothymol blue solution to change color? The bromothymol blue solution changed color because there was a chemical reaction with the carbon dioxide. After the exercising the bromothymol blue turned green faster. This is because the carbon dioxide was expelled into it faster, because of the exercising.
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 |
Why does Bromothymol blue change color when co2 is added?
When to use bromothymol blue as a pH indicator?
red These indicators are normally used over a fairly short range of pH values (indicated in the table above). As a pH indicator, bromothymol blue, for example, would be useful between from about pH 6.0 to pH 7.6. Other indicators work in different pH ranges.
Which is the best pH indicator to use?
As a pH indicator, bromothymol blue, for example, would be useful between from about pH 6.0 to pH 7.6. Other indicators work in different pH ranges. Using bromothymol blue you wouldn’t be able to distinquish between an acid with pH 4 from an acid with pH 5. They would both appear yellow.
What is the pH range of bromophenol red?
pH Indicator Ranges (Ascending pH) pH Range Indicator 2.9 (purple) – 4.6 (green) Methyl Orange – Xylene Cyanol 3.0 (yellow) – 4.6 (blue) Bromophenol Blue 3.0 (blue) – 5.0 (red) Congo Red 3.0 (red) – 6.3 (yellow) Methyl Orange
Which is the pH range of thymol blue?
pH Indicator Ranges (Ascending pH) pH Range Indicator 1.2 (red) – 2.8 (yellow) Thymol Blue 2.9 (purple) – 4.6 (green) Methyl Orange – Xylene Cyanol 3.0 (yellow) – 4.6 (blue) Bromophenol Blue 3.0 (blue) – 5.0 (red) Congo Red
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