0
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 else can I help you with?
What color is phenol red at neutral pH?
Phenol red is a red color at neutral pH. It changes color depending on the pH of the solution it is in.
What is the charge of phenyl group in phenol?
The phenyl group in phenol has no net charge as it is a neutral group. The charge on the phenol molecule is -1 due to the negatively charged oxygen atom present in the hydroxyl group.
What is the derivative of Phenol?
The derivative of Phenol is Carbolic acid.
Does phenol react with bromine?
Yes, at room temperature bromine reacts with phenol and forms 2,4,6-tribromo phenol.
What is a substituted phenol?
Any phenol that has substituents in a 1, 3 configuration.
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)
What color is phenol red at neutral pH?
Phenol red is a red color at neutral pH. It changes color depending on the pH of the solution it is in.
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 is the charge of phenyl group in phenol?
The phenyl group in phenol has no net charge as it is a neutral group. The charge on the phenol molecule is -1 due to the negatively charged oxygen atom present in the hydroxyl group.
Is water more acidic than phenol?
No, water is neutral with a pH of 7. Phenol is slightly acidic with a pH range between 5 and 6.
Why does phenol give a violet colouration with neutral FeCl3?
It is a test for presence of phenol. Fe itself is a transition metal that form a complex ions with phenol. Hence, the Fe can undergo d-d transition that give a colour which is purple in this case.
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.
Is p-nitrophenol a third degree alcohol?
No, it is no alcohol, it is a substituted phenol and is acidic in nature, while alcohols are neutral,.
Is 1-hexanol more acidic or less acidic than phenol?
Phenol is more acidic than 1-hexanol because the hydroxyl group in phenol is directly attached to the aromatic ring, which stabilizes the resulting phenoxide ion through resonance. In contrast, the hydroxyl group in 1-hexanol is attached to an aliphatic chain, making it less acidic.
Give four properties of phenol to show how it differ from alcohol?
1-Phenol (carbolic acid) is acidic in nature and turns blue litmus red while alcohol (ethanol) does not, 2-phenol gives violet or blue colour with neutral ferric chloride solution while alcohol does not, 3-phenol freezes to a solid in fridge while alcohol does not, 4-phenol produces bubbles on rough iron surface while alcohol does not.
Which one give violet color with neutral ferric chloride Salicylaldehyde glycerol benzyl alcohol ethanol?
Salicylaldehyde will give a violet color with neutral ferric chloride.
Why phenol is acidic but ethanol is neutral?
Phenol is acidic because it contains a hydroxyl group directly attached to an aromatic ring, allowing it to donate a proton. Ethanol, on the other hand, is neutral because the hydroxyl group is not as acidic due to the presence of the alkyl group, which stabilizes the molecule and makes it less likely to donate a proton.
