"Phenol red is a pH indicator that is red in basic solutions and and yellow in basic solutions." (McGraw-Hill Human Bio Lab Manual, 12th ed., pg. 94) The solution was was basic and is now acidic due to digestion, so the phenol red is indicating the change.
When universal indicator is added to acetic acid, it typically turns a shade of red, indicating that the solution is acidic. Acetic acid is a weak acid, so the color change may not be as intense as with stronger acids.
In an acid solution the blue litmus paper become red.
Litmus paper will turn red in the presence of sulfuric acid, indicating that the solution is acidic.
phenol red turns yellow because it reacts to carbonic acid, which is a product of carbon dioxide mixing with H2O, or water. Phenol red is a Ph indicator, but not a very good one, so it reacts to strong acids (yellow orange) and strong bases (pink) hope this helped!
The purpose of the experiment is to demonstrate the process of photosynthesis. When the elodea plant is added to the yellow solution (indicating acidity), it will consume carbon dioxide and release oxygen through photosynthesis. This will cause a color change in the solution from yellow to blue as the pH increases due to the removal of carbon dioxide.
When universal indicator is added to acetic acid, it typically turns a shade of red, indicating that the solution is acidic. Acetic acid is a weak acid, so the color change may not be as intense as with stronger acids.
In an acid solution the blue litmus paper become red.
Litmus paper will turn red in the presence of sulfuric acid, indicating that the solution is acidic.
phenol red turns yellow because it reacts to carbonic acid, which is a product of carbon dioxide mixing with H2O, or water. Phenol red is a Ph indicator, but not a very good one, so it reacts to strong acids (yellow orange) and strong bases (pink) hope this helped!
The solution of NaOH in methyl orange indicator will turn from yellow to red. Methyl orange is an acid-base indicator that changes color in response to a change in pH. In the presence of a strong base like NaOH, the indicator will change to a red color indicating the basic nature of the solution.
The purpose of the experiment is to demonstrate the process of photosynthesis. When the elodea plant is added to the yellow solution (indicating acidity), it will consume carbon dioxide and release oxygen through photosynthesis. This will cause a color change in the solution from yellow to blue as the pH increases due to the removal of carbon dioxide.
BTB stains hands and clothes. As carbon dioxide is absorbed from the breath into the solution, forming carbonic acid, the solution changes color from green to yellow.
Litmus paper will turn red in dilute hydrochloric acid, indicating that the solution is acidic.
Bromothymol blue is an indicator that is pale blue in a basic solution and turns yellow in the presence of an acid.
Methyl red will appear yellow in a boric acid solution and red in a mannitol solution.
A NEUTRAL solution. NB Bases in solution are known as ALKALIs.
Hydrochloric acid turns bromothymol blue yellow because the acid changes the pH of the solution, causing the bromothymol blue indicator to shift its color toward the yellow end of the spectrum.