+1 862 207 3288 CHM 1220L: General Chemistry Laboratory II The Titrimetric Determination of the Equiv. Wt. and the pKa for a Weak Acid Lab Report Guide Purpose ? What
scientific question(s) will be answered in this activity?
Introduction ? ? General explanation of the relationship between pH, pKa and equivalent weight concerning weak acids Method utilized in exploring this relationship
Procedure/Experimental ? ? A brief summary of the experimental procedure. What was used or performed that varied from the lab manual descriptions?
Data and Results ? ? ? ? Plots of pH vs. volume of NaOH and 1st derivative from one titration Complete calculations must be shown for the equivalent weight from one
titration pKa value should be reported Table including volume of NaOH used to reach the equivalence point, volume at the half- equivalence point, pH = pKa at half-
equivalence point
Discussion ? ? General discussion of possible errors (calibration, volume measurements, etc…) How would a poorly calibrated pH meter impact the determination of pKa?
Reference(s)
CHM 1220 Lab Reports: Summer 2014 Edition
Please refer to this outline to serve as general guide and refer to your lab manual for more detailed
descriptions.
Sections of a lab report
1. Purpose
a. This section replaces the abstract suggested in “Guidelines…”
b. State the purpose of this work?
i. Is it to test a scientific hypothesis such as verifying gas laws in the upcoming gas
behavior lab or is to answer a scientific question such as, what is the vitamin C
content in a particular sample?
2. Introduction
a. State the objective
b. Methods: state briefly the methods by which the objective will be pursued
i. Are you using a titrimetric method, spectroscopic method, etc.?
ii. For what purpose will you employ these methods?
iii. Leave the details for the Experimental section
3. Experimental
a. In CHM 122oL, always begin with a reference to the experimental procedures in the
laboratory textbook. You may refer to “the laboratory text [1]” or to “Grossie and
Underwood [1]” or to “reference [1]”.
b. Reference 1 in the “References” section should resemble the following but with the
appropriate lab cited:
i. Grossie, D. A. and Underwood, K., Laboratory Guidefor Chemistry, 6”‘ ed.,
Analysis of Hydrated Copper Sulfate”, Wright State University, Dayton, 2011,
Exp’t 2, pp. 11-18.
c. A brief statement of experimental method so that the reader need not have a copy of
the text to know the general methods used.
d. Details of any changes (omissions/additions)
e. “Materials used” (p xx) not so important for CHM 122oL reports.
4. Data and Results
a. Primarily narrative text, supported with tables, graphs, figures as is appropriate to each
exp’t.
b. Organize presentation in logical order
c. For example, wt. % composition of Cu, sulfate, water kml empirical formula
determination
d. Report “Significant Outcomes” – present the relevant results, those used to address the
purpose of the exp’t.
e. Omit small details. e.g., mass of filter paper
f. Tables, Graphs, Figures presented within the report in an appropriate order.
g. Properly labeled (see p.xx)
Thanks and please find the attachment of the outline. ” skip the date part”
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