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Week 35, Chemistry 4, Task 1, Sec. 18.5 The pH of a Mixture of Weak Acids and the Percent Dissociation”

Last updated over 5 years ago
5 questions
Chapter 13: Acids and Bases
Chemistry 4, Task 1: Section 13.5: Calculating the pH of Weak Acid Solutions Part 2: Mixture of Weak Acids and Percent Dissociation of Acids.

Task 1: Due on Monday, Apr. 27, 2020
By the end of this task, you will be able to:
  • Calculate the pH of a mixture of weak acids.
  • Calculate the percent dissociation of acids.
  • Calculate the Ka using percent dissociation.
Watch the attached video recording titled “pH of a Mixture of Weak Acids” to understand how to calculate the pH when two or more weak acids are mixed. Then, answer the questions that follow.

4

Use the values of Ka from the table below:

Watch the attached video recording titled “Percent Dissociation of Acids” to understand how to calculate the percentage by which an acid will ionize. Then, answer the questions that follow.

3

  1. Calculate the percent dissociation of acetic acid for each of the following concentrations:
a. 0.50 M CH3COOH
b. 0.05 M CH3COOH

2. Compare and deduce the impact of diluting an acid on its dissociation.

Watch the attached video recording titled “How to Calculate Ka Using Percent Dissociation” to understand how the percent dissociation of an acid could be used in order to calculate the acid dissociation constant Ka. Then, answer the questions that follow.

3

Note: Use this reaction to represent the dissociation of the weak acid:

HA (aq) ↔️H+ + A - (aq)

0

Assess your level of confidence regarding your understanding of this task.

0

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