Homework Answers
Ans: (1). From the pH titration graph, the approximate pKa1 of the oxalic acid is around 1.3 and the Pka2 of this acid is around 4.5.
(2). It is observed that there are two verticle lines in the graph, one is around 25 mL and another is in the 50 mL value. During the titration of Oxalic acid with NaOH, in the first neutralization point, there is a sudden jump in 25 mL and a similar observation during the pKa2 found the sudden jump.
(3). After the acid-base neutralization is over there is small change of the pH which is because of the excess NaOH in the medium. Since after the neutralization point, some excess NaOH is added hence it show small increases in the pH.
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Focus on Step A5 of the procedure, where one
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sample in the plastic cup or beaker before beginning the
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Note that this step was also repeated in the potentiometric
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In both cases, the addition of more water was an experimental
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Focus on Step A5 of the procedure, where one
partner prepared their sample for visual titration by adding
approximately 100mL of water to the to
sample in the plastic cup or beaker before beginning the
titration.
Note that this step was also repeated in the potentiometric
(pH-meter) titration in Part 2 (Step A7).
In both cases, the addition of more water was an experimental
necessity, to allow the solution to be stirred easily and to ensure
that the pH probe...
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Experiment 4: Identification of an unknown acid by titration Page 2 of 15 Background In this experiment, you will use both qualitative and quantitative properties to determine an unknown acid's identity and concentration. To do this analysis, you will perform a titration of your unknown acid sample-specifically a potentiometric titration where you use a pH meter and record pH values during the titration, combined with a visual titration using a color indi- cator...
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