2. Error Analysis (4 pts) o Typed discussion of the degree of agreement between

Question

2. Error Analysis (4 pts)

o   Typed discussion of the degree of agreement between your trials. If error appears to be present, explain possible sources. Note that “human error” is not an acceptable answer. Please be specific.

3. Post Lab Questions (5 pts)

o   Typed answers to the Post Lab questions. Note that single sentence answers will not suffice. State the answer to the question followed by a brief description of the evidence supporting that answer.

Post Lab Questions:

1. Why is it important to record the endpoint of the titration at the permanent faint pink color as opposed to the permanent dark pink color?

2. Calculate what the MACID would be if the acid were diprotic (able to donate two protons).

3. Why is the stir bar used?

4. Would it be possible to do this experiment without using an indicator dye? If so, explain how.

5. Is the titration technique limited to acid/base reactions?

Explanation / Answer

1). The endpoint of the titration at the permanent faint pink color indicates that the equivalence point has been reached, at the endpoint the reaction has finished. If unsure, you can always note the volume, and then add another drop of the base to get the permanent faint pink color.

2).

3). The stir bar is useful to spinning rapidly in the center of the flask but not splashing. While spinning chemical will mix properly. If spinning is not clear we will get a false titration volume.

4). Yes, You could use a pH meter instead of an indicator dye, that's the high-tech method.

5). No Not at all. Another very important analytical tool is the redox titration. This is titrating oxidising agents against reducing agents.

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