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Complete the following table, which lists information about the measured acid dissociation constants of three unknown weak acids. Note: be sure each number you put in the table has the correct number of significant digits. acid A B C Ka 7.26 X 10 1. X 10 -9 pKa 0 4.73 0 relative strength (Choose one) C (Choose one) (Choose one) C x10 X

Complete the following table, which lists information about the measured acid dissociation constants of three unknown weak acids. Note: be sure each number you put in the table has the correct number of significant digits. acid A B C Ka 7.26 X 10 1. X 10 -9 pKa 0 4.73 0 relative strength (Choose one) C (Choose one) (Choose one) C x10 X

Chemistry
Chemistry
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
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**Educational Exercise: Acid Dissociation Constants** **Objective:** Complete the following table, which lists information about the measured acid dissociation constants of three unknown weak acids. **Instructions:** Ensure each number you input into the table maintains the correct number of significant digits. --- | **Acid** | \( K_a \) | \( pK_a \) | **Relative Strength** | |----------|-------------------------|-------------|-----------------------| | A | \( 7.26 \times 10^{-7} \) | [Input Value] | (Choose one) | | B | [Input Value] | 4.73 | (Choose one) | | C | \( 1. \times 10^{-9} \) | [Input Value] | (Choose one) | --- **Instructions for Completing the Table:** 1. **Calculate \( pK_a \)**: - Use the formula \( pK_a = -\log_{10}(K_a) \) to compute the \( pK_a \) values for each given \( K_a \). 2. **Determine Relative Strength**: - Evaluate the relative strength of each acid using the \( K_a \) and \( pK_a \) values. - Generally, a smaller \( pK_a \) indicates a stronger acid. 3. **Significant Digits**: - Ensure all calculated values maintain proper significant figures based on the given data. **Tools Provided:** - The interface includes a calculator function to assist with logarithmic calculations. **Note**: Click the dropdown arrows in the "Relative Strength" column to select an option: strong, moderate, or weak. --- This exercise helps reinforce your understanding of acid dissociation constants and their significance in assessing acid strength.
Transcribed Image Text:**Educational Exercise: Acid Dissociation Constants** **Objective:** Complete the following table, which lists information about the measured acid dissociation constants of three unknown weak acids. **Instructions:** Ensure each number you input into the table maintains the correct number of significant digits. --- | **Acid** | \( K_a \) | \( pK_a \) | **Relative Strength** | |----------|-------------------------|-------------|-----------------------| | A | \( 7.26 \times 10^{-7} \) | [Input Value] | (Choose one) | | B | [Input Value] | 4.73 | (Choose one) | | C | \( 1. \times 10^{-9} \) | [Input Value] | (Choose one) | --- **Instructions for Completing the Table:** 1. **Calculate \( pK_a \)**: - Use the formula \( pK_a = -\log_{10}(K_a) \) to compute the \( pK_a \) values for each given \( K_a \). 2. **Determine Relative Strength**: - Evaluate the relative strength of each acid using the \( K_a \) and \( pK_a \) values. - Generally, a smaller \( pK_a \) indicates a stronger acid. 3. **Significant Digits**: - Ensure all calculated values maintain proper significant figures based on the given data. **Tools Provided:** - The interface includes a calculator function to assist with logarithmic calculations. **Note**: Click the dropdown arrows in the "Relative Strength" column to select an option: strong, moderate, or weak. --- This exercise helps reinforce your understanding of acid dissociation constants and their significance in assessing acid strength.
Expert Solution
Step 1: Defining pKa

Answer:

The value of pKa is equal to the negative of logarithm of Ka and higher the value of pKa, weaker the acid and vice versa.

pK subscript straight a equals negative logK subscript straight a

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