penn state chem 113 week 10 post lab questions and analysis complete a
Penn State CHEM 113 Week 10 Post Lab Questions and Analysis
Complete all questions by handwriting the answers directly into your lab notebook. When answering
questions, be sure to fully explain your answers. For more detailed instructions, review the Claim,
Evidence, Reasoning video.
Section F-G. Titration of a Weak Acid with a Strong Base; Interpretation of Titration Curves and
Application to Buffer Systems
(a) Plot your data for the titration of acetic acid with sodium hydroxide directly on Figure 1 (page
81). Draw a smooth curve through the points. Cut out and tape this figure into your lab
(b) On your experimental titration curve, label:
• The beginning of the titration (before any NaOH has been added) as point A.
• The equivalence point as point B.
• A point well past the equivalence point as point C.
NOTE: Data selected from the computer simulation show that the equivalence point pH is
8.31 and that it occurs after the addition of exactly 5 drops of 0.01 M NaOH.
(c) Label the pH at each point, A-C.
(d) Label the dominant species in solution at each point, A-C.
(e) Label the half-equivalence point and pka.
(f) Draw a box around the buffer region and label the two chemical species that form the buffer
Does the pH at the equivalence point make sense? Explain your answer based on what the
dominant species are in the solution at that point.
Determine the K₂ for CH3COOH from your experimental titration data. How does this value
compare to the K₂ you determined from the computer-generated titration curve in ILQ1?/nQ4.
Report how many drops of NaOH you used to prepare your buffer solution and report the pH
measured for this buffer solution. Based on the titration curve in Figure 1 and your table from
ILQ2, is this the pH that you expected? Explain.
Section H. Dilution of Buffers
Use the Claim, Evidence, Reasoning method to explain the effect of dilution on the pH of
Use the Claim, Evidence, Reasoning method to explain the effect of dilution on buffer capacity.
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