What PH Range And Color Of Phenolphthalein In Acidic Medium?

16 Jun 2024
Barokah2
Andi

Which of the following pH range and colour is correct with respect to phenolphthalein indicator in acidic medium?

Phenolphthalein is a chemical compound that is used as an indicator in acid-base titrations. It is colourless in acidic solutions and turns pink in basic solutions. The pH range of phenolphthalein is 8.2 to 10.0. In acidic medium, the pH is less than 8.2, and phenolphthalein remains colourless.

Therefore, the correct answer is colourless.

Which of the following pH range and colour is correct with respect to phenolphthalein indicator in acidic medium?

Colourless: In acidic medium, phenolphthalein is colourless.
Indicator: Phenolphthalein is used as an indicator in acid-base titrations.
pH range: The pH range of phenolphthalein is 8.2 to 10.0.
Acidic: In acidic medium, the pH is less than 8.2.
Base: In basic solutions, phenolphthalein turns pink.

These are some of the key aspects of phenolphthalein and its use as an indicator in acidic medium. Phenolphthalein is a versatile and useful indicator that can be used in a variety of applications.

Colourless

This statement is directly related to the question "which of the following pH range and colour is correct with respect to phenolphthalein indicator in acidic medium?". Phenolphthalein is an indicator that is used to test the pH of a solution. In acidic solutions, phenolphthalein is colourless. This is because the pH of the solution is less than 8.2, which is the lower limit of the pH range for phenolphthalein.

Facet 1: Acid-base reactions
In acid-base reactions, phenolphthalein can be used to indicate the endpoint of the reaction. The endpoint is the point at which the solution has reached a neutral pH. At this point, the phenolphthalein will turn from colourless to pink.
Facet 2: Titrations
Phenolphthalein is also used in titrations. A titration is a laboratory technique that is used to determine the concentration of a solution. In a titration, a known volume of a solution with a known concentration is added to a solution with an unknown concentration. The phenolphthalein is used to indicate the endpoint of the titration. At the endpoint, the solution will have reached a neutral pH and the phenolphthalein will turn from colourless to pink.

These are just two of the many applications of phenolphthalein. It is a versatile and useful indicator that can be used in a variety of settings.

Indicator

The connection between "Indicator: Phenolphthalein is used as an indicator in acid-base titrations." and "which of the following pH range and colour is correct with respect to phenolphthalein indicator in acidic medium" is that phenolphthalein is used to indicate the endpoint of an acid-base titration. The endpoint is the point at which the solution has reached a neutral pH. At this point, the phenolphthalein will turn from colourless to pink.

Phenolphthalein is a versatile and useful indicator that can be used in a variety of applications. It is a valuable tool for chemists and other scientists.

pH range

The pH range of phenolphthalein is important because it determines the color of the indicator in different solutions. In acidic solutions, the pH is less than 8.2 and phenolphthalein is colorless. In basic solutions, the pH is greater than 8.2 and phenolphthalein is pink. This color change can be used to indicate the endpoint of an acid-base titration.

For example, in a titration of a weak acid with a strong base, the phenolphthalein indicator will remain colorless until the equivalence point is reached. At the equivalence point, the pH of the solution will be 8.2 and the phenolphthalein will turn pink. This indicates that the acid has been completely neutralized by the base.

The pH range of phenolphthalein is also important in other applications, such as the preparation of buffer solutions. Buffer solutions are solutions that resist changes in pH when small amounts of acid or base are added. Phenolphthalein can be used to indicate the pH of a buffer solution and to ensure that the pH remains within a desired range.

Overall, the pH range of phenolphthalein is an important property that determines its usefulness as an indicator in acid-base titrations and other applications.

Acidic

The statement "Acidic: In acidic medium, the pH is less than 8.2" is directly related to the question "which of the following pH range and colour is correct with respect to phenolphthalein indicator in acidic medium". This is because the pH range of phenolphthalein is 8.2 to 10.0. In acidic medium, the pH is less than 8.2, and phenolphthalein remains colourless.

Facet 1: Acidic solutions
Acidic solutions have a pH of less than 7.0. In acidic solutions, hydrogen ions (H+) are more concentrated than hydroxide ions (OH-). This can be due to the presence of a strong acid, such as hydrochloric acid (HCl), or a weak acid, such as acetic acid (CH3COOH).
Facet 2: Phenolphthalein indicator
Phenolphthalein is a chemical compound that is used as an indicator in acid-base titrations. It is colourless in acidic solutions and turns pink in basic solutions. The pH range of phenolphthalein is 8.2 to 10.0.
Facet 3: Acidic medium
In acidic medium, the pH is less than 8.2. This means that the solution contains more hydrogen ions than hydroxide ions. In acidic medium, phenolphthalein remains colourless.
Facet 4: Colourless
In acidic medium, phenolphthalein is colourless. This is because the pH of the solution is less than 8.2, which is the lower limit of the pH range for phenolphthalein.

These facets all come together to explain why phenolphthalein is colourless in acidic medium. This is an important concept to understand when using phenolphthalein as an indicator in acid-base titrations.

Base

The statement "Base: In basic solutions, phenolphthalein turns pink." is directly related to the question "which of the following pH range and colour is correct with respect to phenolphthalein indicator in acidic medium". This is because the pH range of phenolphthalein is 8.2 to 10.0. In acidic medium, the pH is less than 8.2, and phenolphthalein remains colourless. However, in basic solutions, the pH is greater than 8.2, and phenolphthalein turns pink.

Facet 1: Basic solutions
Basic solutions have a pH of greater than 7.0. In basic solutions, hydroxide ions (OH-) are more concentrated than hydrogen ions (H+). This can be due to the presence of a strong base, such as sodium hydroxide (NaOH), or a weak base, such as ammonia (NH3).
Facet 2: Phenolphthalein indicator
Phenolphthalein is a chemical compound that is used as an indicator in acid-base titrations. It is colourless in acidic solutions and turns pink in basic solutions. The pH range of phenolphthalein is 8.2 to 10.0.
Facet 3: Basic medium
In basic medium, the pH is greater than 8.2. This means that the solution contains more hydroxide ions than hydrogen ions. In basic medium, phenolphthalein turns pink.
Facet 4: Pink
In basic medium, phenolphthalein turns pink. This is because the pH of the solution is greater than 8.2, which is the upper limit of the pH range for phenolphthalein.

These facets all come together to explain why phenolphthalein turns pink in basic medium. This is an important concept to understand when using phenolphthalein as an indicator in acid-base titrations.

FAQs about "which of the following pH range and colour is correct with respect to phenolphthalein indicator in acidic medium"

This section provides answers to frequently asked questions about the pH range and colour of phenolphthalein indicator in acidic medium.

Question 1: What is the pH range of phenolphthalein?

The pH range of phenolphthalein is 8.2 to 10.0.

Question 2: What colour is phenolphthalein in acidic medium?

Phenolphthalein is colourless in acidic medium.

Question 3: What colour is phenolphthalein in basic medium?

Phenolphthalein is pink in basic medium.

Question 4: Why does phenolphthalein change colour?

Phenolphthalein changes colour because it is a weak acid. In acidic solutions, phenolphthalein is protonated and colourless. In basic solutions, phenolphthalein is deprotonated and pink.

Question 5: What is phenolphthalein used for?

Phenolphthalein is used as an indicator in acid-base titrations.

Question 6: Is phenolphthalein safe to use?

Phenolphthalein is generally safe to use, but it can be harmful if ingested. It is important to follow the manufacturer's instructions when using phenolphthalein.

These are just a few of the most frequently asked questions about phenolphthalein. For more information, please consult a reputable source.

Summary: Phenolphthalein is a weak acid that is used as an indicator in acid-base titrations. It is colourless in acidic medium and pink in basic medium. Phenolphthalein is generally safe to use, but it is important to follow the manufacturer's instructions.

Transition to the next article section: The next section of this article will discuss the applications of phenolphthalein in more detail.

Conclusion

In this article, we have explored the question "which of the following pH range and colour is correct with respect to phenolphthalein indicator in acidic medium". We have learned that the pH range of phenolphthalein is 8.2 to 10.0, and that phenolphthalein is colourless in acidic medium. We have also discussed the applications of phenolphthalein as an indicator in acid-base titrations.

Phenolphthalein is a valuable tool for chemists and other scientists. It is a versatile and useful indicator that can be used in a variety of applications. We encourage you to learn more about phenolphthalein and its uses.

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