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 happens to the pH of bromothymol blue solution when carbon dioxide concentration increases slowly?
Bromthymol blue changes color over a pH range from 6.0 (yellow) to 7.6 (blue). Low levels of carbon dioxide or acid in solution with bromothymol blue indicator will appear blue. As the level of carbon dioxide or acid increases, the solution will gradually take
on a yellow tint
.
What color does BTB turn when carbon dioxide is present?
Bromothymol blue solution, BTB, can indicate the presence of carbon dioxide in the water. When little or no carbon dioxide is present, BTB will show a blue color. Depending upon the amount of carbon dioxide, BTB will change to
green or yellow
.
What happens when you add co2 to BTB?
BTB is an acid indicator; when it reacts with acid it turns from blue to yellow. When carbon dioxide reacts with water, a
weak acid
(carbonic acid) is formed (see chemical reaction below). The more carbon dioxide you breathe into the BTB solution, the faster it will change color to yellow.
What is the purpose of bromothymol blue in the solution?
The main uses of bromothymol blue are
for testing pH and for testing photosynthesis and respiration
. 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).
Why is bromothymol blue a good indicator?
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 (CO
2
) and other weakly acidic solutions
. … As the level of carbon dioxide or acid increases, the solution will gradually take on a yellow tint.
How long does bromothymol blue take to change color?
Pour the diluted bromothymol blue solution into a beaker. Place a straw in the liquid and exhale gently into it. Allow the exhaled air to bubble through the liquid until the solution turns yellow-green. This will take
15 to 30 minutes
.
What happens if you drink bromothymol blue?
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.
What Colour does bromothymol blue turn in water?
Bromothymol is used in obstetrics for detecting premature rupture of membranes. Amniotic fluid typically has a pH > 7.2, bromothymol will therefore turn
blue
when brought in contact with fluid leaking from the amnion. As vaginal pH normally is acidic, the blue color indicates the presence of amniotic fluid.
Does your body breathe out CO2?
The lungs and respiratory system allow us to breathe. They bring oxygen into our bodies (called inspiration, or inhalation) and send carbon dioxide out (called
expiration
, or exhalation). This exchange of oxygen and carbon dioxide is called respiration.
What color does BTB turn when in an acidic solution?
BTB is a weak acid and it is almost red in color. However, when it reacts with acidic solution then it turns into
yellow color
and blue color after reacting with alkaline solution. At neutral pH (7.0) it shows bluish green color. You can find the witness at the attached image of different solutions.
What Colour does thymol blue turn in a neutral solution?
It turns
purple
in neutral solutions. Litmus paper is usually more reliable, and comes as red litmus paper and blue litmus paper.
What evidence is there that the CO2 gas dissolved in the BTB solution?
When gas containing CO2 is bubbled through a BTB solution,
carbonic acid forms and the indicator turns from dark blue to green, yellow, or very pale yellow depending on the CO2
concentration (lighter colors mean higher concentrations).
When someone breathes into Bromothymol blue and it turns green or yellow Why does it do that?
Breathing rate increases with in increase of physical activity. Bromothymol blue is in indicator for carbon dioxide which means that it will change color if carbon dioxide is present. Bromothymol blue solution changes color from blue to green or from blue to yellow when
carbon dioxide if bubbled into it
.
Is CO2 acidic or alkaline?
Carbon dioxide, which is
mildly acidic
, is a waste product of the processing (metabolism) of oxygen and nutrients (which all cells need) and, as such, is constantly produced by cells.
