Understand The Perfect PH Range And Color For Phenolphthalein In Acidic Environments

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

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

Therefore, the correct answer is: Colorless

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

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

• Colorless in acidic medium
• pH range of 8.2 to 10.0
• Used as an indicator in acid-base titrations
• Turns pink in basic solutions
• Remains colorless below pH 8.2
• Chemical compound

Phenolphthalein is a weak acid with a pKa of 9.7. In acidic solutions, the phenolphthalein molecule is protonated and colorless. As the pH of the solution increases, the phenolphthalein molecule loses its proton and becomes deprotonated, resulting in the formation of the pink phenolphthalein anion. The pH range over which phenolphthalein changes color is from 8.2 to 10.0, which makes it a useful indicator for acid-base titrations.

Colorless in acidic medium

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

• Definition: Colorless in acidic medium refers to the property of phenolphthalein to remain colorless in acidic solutions.
• pH range: The pH range over which phenolphthalein is colorless is less than 8.2.
• Chemical structure: In acidic medium, the phenolphthalein molecule is protonated and colorless.
• Applications: Phenolphthalein is used as an indicator in acid-base titrations to determine the endpoint of the titration.

The colorless appearance of phenolphthalein in acidic medium is due to the protonation of the phenolphthalein molecule. When the pH of the solution is increased, the phenolphthalein molecule loses its proton and becomes deprotonated, resulting in the formation of the pink phenolphthalein anion. This color change is used to indicate the endpoint of an acid-base titration.

pH range of 8.2 to 10.0

The pH range of 8.2 to 10.0 is significant in relation to "which of the following pH range and color is correct with respect to phenolphthalein indicator in acidic medium?" because it represents the range over which phenolphthalein changes color.

• Color change: Phenolphthalein is colorless in acidic solutions and turns pink in basic solutions. The pH range over which this color change occurs is from 8.2 to 10.0.
• Acid-base indicator: Phenolphthalein is commonly used as an indicator in acid-base titrations. It is added to the solution being titrated and changes color at the endpoint of the titration, indicating the point at which the acid and base have been neutralized.
• Applications: Phenolphthalein is used in a variety of applications, including:
  • Acid-base titrations
  • pH
  • Laxatives

The pH range of 8.2 to 10.0 is important to consider when using phenolphthalein as an indicator because it determines the color of the solution and the accuracy of the titration. If the pH of the solution is below 8.2, the phenolphthalein will remain colorless. If the pH of the solution is above 10.0, the phenolphthalein will turn pink, even if the solution is not yet neutralized. Therefore, it is important to use phenolphthalein in the pH range of 8.2 to 10.0 to ensure accurate results.

Used as an indicator in acid-base titrations

Phenolphthalein is commonly used as an indicator in acid-base titrations. This is because it undergoes a distinct color change over a narrow pH range, making it easy to determine the endpoint of the titration. The endpoint of a titration is the point at which the acid and base have been completely neutralized. At this point, the pH of the solution will be equal to the pKa of the indicator.

The pH range over which phenolphthalein changes color is from 8.2 to 10.0. This means that it is most effective for titrating strong acids with strong bases. If the acid or base is weak, the equivalence point may be outside of the pH range of phenolphthalein, and the color change may not be visible.

Turns pink in basic solutions

The connection between "Turns pink in basic solutions" and "which of the following pH range and color is correct with respect to phenolphthalein indicator in acidic medium?" is that the color change of phenolphthalein is a key factor in determining the correct pH range and color for this indicator in acidic medium.

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

Therefore, the correct pH range and color for phenolphthalein indicator in acidic medium is colorless. This is because the pH of acidic solutions is less than 8.2, which is the lower limit of the pH range over which phenolphthalein changes color.

The color change of phenolphthalein is a useful tool for determining the endpoint of an acid-base titration. The endpoint is the point at which the acid and base have been neutralized and the pH of the solution is equal to the pKa of the indicator. For phenolphthalein, the pKa is 9.7. This means that the endpoint of a titration using phenolphthalein as an indicator will be at a pH of 9.7.

Phenolphthalein is a valuable tool for acid-base titrations because it provides a clear and easy-to-see color change at the endpoint. This makes it possible to accurately determine the concentration of an unknown acid or base.

Remains colorless below pH 8.2

The connection between "Remains colorless below pH 8.2" and "which of the following pH range and color is correct with respect to phenolphthalein indicator in acidic medium?" is that the color of phenolphthalein indicator in acidic medium is determined by the pH of the solution. Phenolphthalein is colorless in acidic solutions and turns pink in basic solutions. The pH range over which phenolphthalein changes color is from 8.2 to 10.0. Therefore, in acidic medium, the pH of the solution is less than 8.2 and the phenolphthalein indicator remains colorless.

This is important because it allows phenolphthalein to be used as an indicator in acid-base titrations. An acid-base titration is a laboratory technique used to determine the concentration of an unknown acid or base. Phenolphthalein is added to the solution being titrated and changes color at the endpoint of the titration, indicating the point at which the acid and base have been neutralized.

If phenolphthalein did not remain colorless below pH 8.2, it would not be a useful indicator for acid-base titrations. This is because the indicator would change color before the endpoint of the titration was reached, giving an inaccurate result.

Therefore, the fact that phenolphthalein remains colorless below pH 8.2 is essential for its use as an indicator in acid-base titrations.

Chemical compound

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

The chemical structure of phenolphthalein is important because it determines its properties as an indicator. Phenolphthalein is a weak acid with a pKa of 9.7. In acidic solutions, the phenolphthalein molecule is protonated and colorless. As the pH of the solution increases, the phenolphthalein molecule loses its proton and becomes deprotonated, resulting in the formation of the pink phenolphthalein anion.

The connection between "chemical compound" and "which of the following pH range and color is correct with respect to phenolphthalein indicator in acidic medium?" is that the chemical structure of phenolphthalein determines its pH range and color change. The pH range over which phenolphthalein changes color is determined by the pKa of the compound. The color change is due to the protonation and deprotonation of the phenolphthalein molecule.

The understanding of the chemical structure of phenolphthalein is important for its use as an indicator in acid-base titrations. By understanding the pH range and color change of phenolphthalein, chemists can accurately determine the endpoint of a titration.

FAQs on Phenolphthalein Indicator in Acidic Medium

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

Here are some frequently asked questions about "which of the following pH range and color is correct with respect to phenolphthalein indicator in acidic medium?":

Question 1: What is the pH range over which phenolphthalein changes color?

Answer: The pH range over which phenolphthalein changes color is from 8.2 to 10.0.

Question 2: What is the color of phenolphthalein in acidic medium?

Answer: Phenolphthalein is colorless in acidic medium.

Question 3: Why is phenolphthalein used as an indicator in acid-base titrations?

Answer: Phenolphthalein is used as an indicator in acid-base titrations because it undergoes a distinct color change over a narrow pH range, making it easy to determine the endpoint of the titration.

Question 4: What is the endpoint of an acid-base titration?

Answer: The endpoint of an acid-base titration is the point at which the acid and base have been completely neutralized and the pH of the solution is equal to the pKa of the indicator.

Question 5: What is the pKa of phenolphthalein?

Answer: The pKa of phenolphthalein is 9.7.

Question 6: How is phenolphthalein prepared?

Answer: Phenolphthalein is prepared by reacting phthalic anhydride with phenol in the presence of sulfuric acid.

We hope these FAQs have helped you to better understand "which of the following pH range and color is correct with respect to phenolphthalein indicator in acidic medium?". If you have any further questions, please feel free to contact us.

Conclusion

In this article, we have explored "which of the following pH range and color is correct with respect to phenolphthalein indicator in acidic medium?". We have discussed the pH range over which phenolphthalein changes color, the color of phenolphthalein in acidic medium, and the uses of phenolphthalein as an indicator in acid-base titrations. We have also answered some frequently asked questions about phenolphthalein.

We hope that this article has helped you to better understand phenolphthalein and its use as an indicator in acid-base titrations. If you have any further questions, please feel free to contact us.

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