4. How many grams of sodium lactate, NaC3H5O3, should be added to 1.00L of 0.150M lactic acid, HC3H503, to form a buffer solution with a pH of 3.90? Assume no volume change when the sodium lactate is added. Ka of lactic acid is 1.40 x 10-4.
4. How many grams of sodium lactate, NaC3H5O3, should be added to 1.00L of 0.150M lactic acid, HC3H503, to form a buffer solution with a pH of 3.90? Assume no volume change when the sodium lactate is added. Ka of lactic acid is 1.40 x 10-4.
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
Problem 1RQ: Define and explain the differences between the following terms. a. law and theory b. theory and...
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Transcribed Image Text:**Question 4: Buffer Solution Calculation**
**Problem Statement:**
How many grams of sodium lactate, NaC₃H₅O₃, should be added to 1.00 L of 0.150 M lactic acid, HC₃H₅O₃, to form a buffer solution with a pH of 3.90? Assume no volume change when the sodium lactate is added. The \(K_a\) of lactic acid is \(1.40 \times 10^{-4}\).
**Details:**
- Calculate the amount of sodium lactate required to achieve the desired pH in the buffer solution.
- Use the provided acid dissociation constant (\(K_a\)) for lactic acid in your calculations.
- Consider the Henderson-Hasselbalch equation for the relation between pH, \(K_a\), and the concentrations of the acid and salt.
**Objective:**
To understand the application of buffer solutions in chemical equilibrium and pH stability.
**Key Concepts:**
- Buffer Solutions
- Henderson-Hasselbalch Equation
- Acid-Base Equilibria
This exercise demonstrates the practical application of chemistry principles in solution preparation and pH management.
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