Penn State CHEM 111
Why not just do a “regular” titration? –
i.e., what is the advantage of a back titration in this case?
Section F: Acid Concentration in Fruits
Please change the hypothesis in your Chemtrek to: There is a hypothesis that the pucker-promoting
potential of fruits and fruit juices is directly proportional to the concentration of organic acids present in
the fruit. Knowing that the order of sour taste, or pucker power, is Lemon > lime > grapefruit > orange for
fruit juices, please use the information in the video to tell us whether you accept or reject the hypothesis.
Pre-lab data collection and observations. Complete before lab.
Read through this section in your Chemtrek and watch the video associated with this section. In the space
below, summarize how the experiment was performed. Include any data and observations from the video
in a table.
Report the concentration of acid in each of the fruit juices.