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.

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**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.
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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