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Information Stock acetic acid concentration: 1.0184 mol/L Stock sodium acetate concentration: 1.0166 mol/L pKa of acetic acid = 4.75   a) Calculate the pH of the stock acetic acid solution and the pH of the stock sodium acetate solution b) Calculate the pH of the undiluted buffer c) Calculate the pH of the 50% buffer *The file included explains how the buffers were prepared

Information Stock acetic acid concentration: 1.0184 mol/L Stock sodium acetate concentration: 1.0166 mol/L pKa of acetic acid = 4.75   a) Calculate the pH of the stock acetic acid solution and the pH of the stock sodium acetate solution b) Calculate the pH of the undiluted buffer c) Calculate the pH of the 50% buffer *The file included explains how the buffers were prepared

Chemistry: Principles and Practice
Chemistry: Principles and Practice
3rd Edition
ISBN:9780534420123
Author:Daniel L. Reger, Scott R. Goode, David W. Ball, Edward Mercer
Publisher:Daniel L. Reger, Scott R. Goode, David W. Ball, Edward Mercer
Chapter16: Reactions Between Acids And Bases
Section: Chapter Questions
Problem 16.78QE
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Information

Stock acetic acid concentration: 1.0184 mol/L

Stock sodium acetate concentration: 1.0166 mol/L

pKa of acetic acid = 4.75

 

a) Calculate the pH of the stock acetic acid solution and the pH of the stock sodium acetate solution

b) Calculate the pH of the undiluted buffer

c) Calculate the pH of the 50% buffer

*The file included explains how the buffers were prepared

Part C: Preparation and Dilution of a Buffer Use a graduated cylinder to measure volumes. • Obtain 100 mL of 1 M acetic acid and 100 mL of 1 M sodium acetate solutions from the stock bottles. Record the actual concentrations of these solutions as indicated on the stock bottles. Measure the pH of these two solutions using the pH meter. Prepare a buffer solution by mixing 100 mL 1 M acetic acid with 100 mL 1 M sodium acetate solution. Stir. Prepare a 50% buffer solution by adding 100 mL of this buffer to 100 mL deionized water; stir. Prepare a 25% buffer solution by adding 100 mL of 50% buffer to 100 mL deionized water; stir. • Measure the pH of the 3 buffer solutions. Save buffer solutions for next part. Addition of strong base to buffered and unbuffered solutions: • Clean the burette used in part A/B, rinse and then fill with 3 M NaOH • With a graduated cylinder, measure 75 mL of the original buffer solution into a 200 mL Berzelius beaker and place the magnetic stir bar in this solution. Set up your burette, stirrer and pH probe as in part A/B. Using the burette, add ~1 mL of 3 M NaOH to the buffer, read and record the pH. Continue adding base in 1 mL increments until 15 mL of NaOH has been added. Record the pH after each 1 mL addition of NaOH. Repeat the addition of NaOH in the same manner, using 75 mL of the 50% buffer. Record the pH after every 1 mL addition until a total of 15 mL of NaOH has been added. Repeat the addition of NaOH in the same manner, using 75 mL of the 25% buffer. Record the pH after every 1 mL addition until a total of 15 mL of NaOH has been added. • Repeat the addition of NaOH in the same manner, using 75 mL of deionized water. Record the pH after every 1 mL addition until a total of 15 mL of NaOH has been added.
Transcribed Image Text:Part C: Preparation and Dilution of a Buffer Use a graduated cylinder to measure volumes. • Obtain 100 mL of 1 M acetic acid and 100 mL of 1 M sodium acetate solutions from the stock bottles. Record the actual concentrations of these solutions as indicated on the stock bottles. Measure the pH of these two solutions using the pH meter. Prepare a buffer solution by mixing 100 mL 1 M acetic acid with 100 mL 1 M sodium acetate solution. Stir. Prepare a 50% buffer solution by adding 100 mL of this buffer to 100 mL deionized water; stir. Prepare a 25% buffer solution by adding 100 mL of 50% buffer to 100 mL deionized water; stir. • Measure the pH of the 3 buffer solutions. Save buffer solutions for next part. Addition of strong base to buffered and unbuffered solutions: • Clean the burette used in part A/B, rinse and then fill with 3 M NaOH • With a graduated cylinder, measure 75 mL of the original buffer solution into a 200 mL Berzelius beaker and place the magnetic stir bar in this solution. Set up your burette, stirrer and pH probe as in part A/B. Using the burette, add ~1 mL of 3 M NaOH to the buffer, read and record the pH. Continue adding base in 1 mL increments until 15 mL of NaOH has been added. Record the pH after each 1 mL addition of NaOH. Repeat the addition of NaOH in the same manner, using 75 mL of the 50% buffer. Record the pH after every 1 mL addition until a total of 15 mL of NaOH has been added. Repeat the addition of NaOH in the same manner, using 75 mL of the 25% buffer. Record the pH after every 1 mL addition until a total of 15 mL of NaOH has been added. • Repeat the addition of NaOH in the same manner, using 75 mL of deionized water. Record the pH after every 1 mL addition until a total of 15 mL of NaOH has been added.
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