What volumes of 0.200 M HCOOH and 2.00 M NaOH would make 0.600 L of a buffer with the same pH as a buffer made from 475 mL of 0.200M benzoic acid and 25 mL of 2.00 M NaOH? Volume of HCOOH = L HCOOH Volume of NAOH= L NAOH

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ISBN:9781305957404
Author:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
Publisher:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
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### Buffer Preparation Problem

**Question:**

What volumes of 0.200 M HCOOH and 2.00 M NaOH would make 0.600 L of a buffer with the same pH as a buffer made from 475 mL of 0.200 M benzoic acid and 25 mL of 2.00 M NaOH?

**Answer:**

- Volume of HCOOH = ____ L HCOOH
- Volume of NaOH = ____ L NaOH

**Explanation:**

The problem involves preparing a buffer solution with a specific pH. It requires calculating the necessary volumes of formic acid (HCOOH) and sodium hydroxide (NaOH) to achieve the desired pH, matching a reference buffer made from benzoic acid and NaOH.

**Steps to Consider:**

1. **Calculate the pH of the Reference Buffer:**
   - Use the concentrations and volumes of benzoic acid and NaOH to find the pH.
   - Apply the Henderson-Hasselbalch equation to determine the reference pH.

2. **Determine Required Volumes:**
   - Use the reference pH to calculate the necessary volumes of 0.200 M HCOOH and 2.00 M NaOH to achieve the same pH in the new buffer solution.
   - Ensure that the total volume of the buffer solution is 0.600 L.

This task involves using molarity concepts, buffer calculations, and the Henderson-Hasselbalch equation.
Transcribed Image Text:### Buffer Preparation Problem **Question:** What volumes of 0.200 M HCOOH and 2.00 M NaOH would make 0.600 L of a buffer with the same pH as a buffer made from 475 mL of 0.200 M benzoic acid and 25 mL of 2.00 M NaOH? **Answer:** - Volume of HCOOH = ____ L HCOOH - Volume of NaOH = ____ L NaOH **Explanation:** The problem involves preparing a buffer solution with a specific pH. It requires calculating the necessary volumes of formic acid (HCOOH) and sodium hydroxide (NaOH) to achieve the desired pH, matching a reference buffer made from benzoic acid and NaOH. **Steps to Consider:** 1. **Calculate the pH of the Reference Buffer:** - Use the concentrations and volumes of benzoic acid and NaOH to find the pH. - Apply the Henderson-Hasselbalch equation to determine the reference pH. 2. **Determine Required Volumes:** - Use the reference pH to calculate the necessary volumes of 0.200 M HCOOH and 2.00 M NaOH to achieve the same pH in the new buffer solution. - Ensure that the total volume of the buffer solution is 0.600 L. This task involves using molarity concepts, buffer calculations, and the Henderson-Hasselbalch equation.
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