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The pH of liquid phenol is typically around 6 to 7, indicating that it is slightly acidic. However, phenol can act as a weak acid, and its pH can vary depending on its concentration and the presence of other substances. In concentrated solutions, phenol may exhibit a lower pH due to its acidic properties.
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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.
Why pH of phenol varies in water and glycerin?
The pH of phenol varies in water and glycerin due to differences in their solvent properties. Water, being a polar solvent, can facilitate the ionization of phenol, leading to a lower pH because phenol can donate protons (H⁺ ions). In contrast, glycerin is a less polar solvent and has a higher viscosity, which reduces the solubility and ionization of phenol, resulting in a higher pH. Thus, the solvent's characteristics significantly influence phenol's acidity and its behavior in solution.
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.
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 is equilibrated phenol?
Equilibrated phenol is phenol that has been mixed with an appropriate buffer solution to maintain a specific pH. This helps to stabilize the phenol solution and make it suitable for various biological applications, such as DNA extraction and purification.
What color is phenol red at an acid pH?
Phenol red is yellow at an acid pH.
What state of matter is phenol red solution?
A solution of phenol red is a liquid.
What reaction do you get when you mix phenol red with acids and bases?
Phenol red is yellow under pH=6,8 and pink over a pH=8,2.
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.
Why pH of phenol varies in water and glycerin?
The pH of phenol varies in water and glycerin due to differences in their solvent properties. Water, being a polar solvent, can facilitate the ionization of phenol, leading to a lower pH because phenol can donate protons (H⁺ ions). In contrast, glycerin is a less polar solvent and has a higher viscosity, which reduces the solubility and ionization of phenol, resulting in a higher pH. Thus, the solvent's characteristics significantly influence phenol's acidity and its behavior in solution.
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.
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.
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 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 a solid or liquid?
Phenol is a viscous liquid or can be crystals as phenol has a melting point of 40.5°C which would make it a solid at room temperature.
What color is phenol red at an base pH?
green
Explain the purpose of the phenol red in the medium?
To determine if a bacterium can ferment a particular carbohydrate and determine the end products of that fermentation
