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What color is phenol red dropped into distilled water?
Phenol red dropped into distilled water would give a red color. The color of phenol red varies with the pH: it is yellow below pH 6.8, red at pH 7.4, and pink or purple at pH above 8.2.
What would happen if you replaced neutral red with phenol red in MacConckey agar?
If neutral red were replaced with phenol red in MacConkey agar, the pH indicator's response to acid production would change. Neutral red typically turns red in the presence of acid, indicating lactose fermentation by coliform bacteria, while phenol red changes from red to yellow in acidic conditions. This alteration could lead to misinterpretation of lactose fermenters, as the color changes may not provide the same level of differentiation or clarity for identifying lactose-positive colonies. Thus, the overall effectiveness of the medium for isolating and identifying enteric bacteria could be compromised.
What is the name of the pH indicator used in microbiology?
The pH indicator commonly used in microbiology is phenol red. It changes color depending on the pH of the solution, allowing for easy visualization of pH changes in bacteria cultures.
What is the color of phenol red at acidic pH?
Very strong acid solutions that have phenolphthalein added to them turn orange, but in general acidic solutions with phenolphthalein are colorless. If the solution is titrated to slightly basic (pH > 8.2) it will turn pink. Note that in extremely basic solutions (pH > 13) it will revert to colorless again.
When using the phenol red carbohydrate broth fermentation test at what pH is the pH indicator yellow?
The pH indicator phenol red turns yellow in the fermentation test when the pH drops below 6.8, indicating acid production from fermentation.
What color is phenol red at a neutral?
Phenol red is made by condensation of Phenol and saccharine.pH below 6.8 = YellowpH above 8.2 = Red/FuschiaGradually turns from yellow to red/fuschia (pH between 6.8 and 8.2 = Pinkish)
Is phenol red is a strong base and acids?
Phenol red is a pH indicator that changes color in response to changes in pH, but it is not a base or an acid itself. It is commonly used to visually indicate the pH of a solution by changing from yellow (acidic) to red (neutral) to purple (basic) in color.
Phenol red dropped into distilled water would produce what color?
Phenol red in distilled water would produce a red color. This is because phenol red is a pH indicator that changes color based on the acidity of the solution. In neutral to basic solutions, phenol red appears red.
What color is phenol red at an acid pH?
Phenol red is yellow at an acid pH.
What color is phenol red dropped into distilled water?
Phenol red dropped into distilled water would give a red color. The color of phenol red varies with the pH: it is yellow below pH 6.8, red at pH 7.4, and pink or purple at pH above 8.2.
What will happen to the color of sodium bicarbonate if phenol red is add?
If phenol red is added to sodium bicarbonate, the color of the solution will change based on the pH. In an acidic solution, phenol red will appear yellow, in a neutral solution it will be red, and in an alkaline solution (such as when sodium bicarbonate is added), it will turn a pink or magenta color.
What color is phenol red at an base pH?
green
Does phenol red change baking soda to red?
Phenol red is a pH indicator that changes color in response to pH changes. It turns yellow in acidic conditions and red in basic conditions. When added to a solution containing baking soda (sodium bicarbonate), which is a basic substance, phenol red can turn red.
What is the pH indicator in nutrient agar?
None
Will sodium bicarbonate react with phenol red?
No, sodium bicarbonate will not react with phenol red. Phenol red is a pH indicator that changes color based on pH levels, while sodium bicarbonate is a salt commonly used as an antacid.
When do you use methyl red instead of phenol red?
Methyl red is typically used in pH tests to determine if a solution is acidic (pH<4.4), while phenol red is typically used to approximate the pH of a solution (between pH 6.8-8.4). Use methyl red when you need to indicate a more acidic pH level, and phenol red for a broader pH range closer to neutral.
Purpose of the phenol red in the medium?
Phenol red in the medium is a pH indicator that changes color based on the pH of the solution. It helps to monitor the pH levels of the medium during cell culture experiments. Changes in color indicate changes in pH, allowing researchers to adjust the conditions accordingly.
