Why does BTB change from blue to green?
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 is bromothymol blue?
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 the purpose of the bromothymol blue BTB solution?
Bromothymol blue (also known as bromothymol sulfone phthalein and BTB) is a pH indicator. It is mostly used in applications that require measuring substances that would have a relatively neutral pH (near 7). A common use is for measuring the presence of carbonic acid in a liquid.
Why did the color of the bromothymol blue BTB solution change?
The BTB changes color because it functions as an acid/base indicator. The chemical reaction involves carbon dioxide from the teacher's lungs dissolving in the BTB solution and the water in the solution forming carbonic (weak) acid.
What does it mean when BTB is green?
One quick way to make a batch is to use a plastic gallon (3.78L) jug of distilled water, remove about 100mL of water to make space, then add about 40mL of stock BTB. Because the pH of distilled water is less than 7, the color of the resulting solution may be green or even yellow-green.
Is bromothymol blue green?
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 BTB green?
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 is the purpose of bromothymol blue in this experiment?
The secret to this experiment is a pH indicator called bromothymol blue. Bromothymol blue is used for managing the pH of fish tanks and pools because it can detect weak acids.
What Colour does bromothymol blue change to?
The pH indicator bromothymol blue exists in a range of colors depending on the pH. From low pH to high pH, a bromothymol blue solution ranges in color from yellow to yellow-green to green and greenish-blue and finally to dark blue. The ideal range for bromothymol blue is a pH between 6 and 8.
What color does bromothymol blue turn in a 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).
What color 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).