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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.
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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.
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 is the PH of liquid phenol?
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.
Is phenol red a exothermic change?
Phenol red itself is not an exothermic change; rather, it is a pH indicator that changes color in response to pH levels. When it undergoes a change in pH, such as when it interacts with acids or bases, the process is typically not associated with a significant release of heat. Exothermic reactions involve the release of heat during a chemical reaction, which is not applicable to the color change of phenol red.
What does yellow indicate on the ph scale?
It depends on what indicator you are using. Yellow with the bromothymol blue indicator is acidic, yellow with the methyl orange indicator is basic, yellow with the phenol red indicator is acidic and yellow with the universal indicator is acidic.
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.
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.
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 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.
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.
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.
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.
What color is phenol red at an base pH?
green
What is the pH indicator in TSI agar?
Phenol red is the pH indicator in TSI agar. It turns yellow in an acidic environment below pH 6.8 and red in a basic environment above pH 8.4. This color change helps differentiate between different types of bacterial fermentation patterns.
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
What is the pH indicator in nutrient agar?
None
