**Question 3: When you conduct a titration, how do you choose the best indicator to use?**When conducting a titration, the choice of an appropriate indicator is crucial for accurately determining the endpoint of the titration. The indicator must change color at a pH that corresponds to the equivalence point of the specific reaction. Therefore, understanding the properties of the reacting substances and the expected pH at the equivalence point is essential.To select the best indicator, consider the following steps:1. **Determine the type of titration**: Identify whether you are working with a strong acid-strong base, weak acid-strong base, strong acid-weak base, or weak acid-weak base titration. This will help predict the pH at the equivalence point.2. **Know the pH range of indicators**: Different indicators change color over different pH ranges. For instance, phenolphthalein changes color in the range of pH 8.3 to 10.0, while methyl orange changes between pH 3.1 and 4.4.3. **Match the indicator's range with the equivalence point**: Select an indicator whose color change range overlaps with the pH at the equivalence point of your titration. For example: - For a strong acid-strong base titration, choose an indicator that changes color at neutral pH (around 7), like bromothymol blue. - For a weak acid-strong base titration, select an indicator that changes color in an alkaline range, such as phenolphthalein. - For a strong acid-weak base titration, opt for an indicator that changes color in an acidic range, like methyl orange. - For weak acid-weak base titrations, the equivalence point can vary more, so selecting an appropriate indicator may require more specific pH calculations.4. **Experiment and validate**: Sometimes, it’s beneficial to run a preliminary titration to ensure that the chosen indicator effectively shows the endpoint. Adjust the indicator choice if the color change is not distinct or occurs over an unsuitably wide range of titration volumes.By following these guidelines, you can select an indicator that ensures accurate and observable detection of the titration endpoint, reducing systematic errors, and enhancing the reliability of your results.

Titration - Calculating the concentration of a certain analyte in a mixture is done using the…

Answered: 3. When you conduct a titration, how do…

3. When you conduct a titration, how do you choose the best indicator to use?

10th Edition

ISBN:9781305957404

Author:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste

Publisher:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste

Chapter1: Chemical Foundations

Section: Chapter Questions

Problem 1RQ: Define and explain the differences between the following terms. a. law and theory b. theory and...

Similar questions

Can you distinguish between a strong acid and weak acid (strong base and weak base) by using only the pH indicators like bromothymol blue , litmus paper and pH paper?
Calculate the pH during a titration when 7.62 mL of a 0.15 M HCI solution has reacted with 15.05 mL of 0.13 M NaOH. Give your answer to 2 places after the decimal. Type your answer.....
1. possble fill ins high, low, >7,<7 Consider a concentrated acid solution. Fill in the following sentence to describe this solution.An acidic solution will have a _____H3O+ concentration and a ______OH-concentration which means the pH will be ______ and the pOH will be _________. 2.
What is the endpoint of a titration?