Virtual lab: acid - base titration [25 points; 5 points / question in purple]

This virtual laboratory activity is based on investigation 4 in your AP chemistry lab manual and handout to the in-person lab regarding an acid - base titration lab, where you compare the determination of the unknown acid or base using the equivalence point ( i.e. find the inflection point using your calculus background) versus end point (i.e. pH indicator color change). While investigation 4 analyzes fruit juices, you will be analyzing an aqueous solution of a strong acid (HCl) and strong base (NaOH).

introduction / background / prelab: answer the below questions.

1. definition of some terms;

a. "standardize" in the context of an acid or base titration

b. end point & equivalence point

2. pH indicator:  basis of its action ?  basis of its selection ? (e.g see figure 16.4 The pH ranges for the color changes of some common acid-base indicators, which is in your textbook)

3. msds information on HCl & NaOH

  • view the video on the effect of acid on protein, e.g. your eyes, which can be simulated by egg white
  • view Excel tutorial screencast about derivative BEFORE lab data analysis.
  • experimental protocol in the physical world

    The following videos illustrate / demonstrate the experimental procedure: using a pH indicator or a pH sensor (view up to ~ 4 "), where you will simulate using both tools. use phenolphthalein as your simulated pH indicator.

    your virtual laboratory activity

    4. collect the appropriate experimental data

    for both the unknown acid and unknown base, so there should be two different data tables. feel free to redo the simulated lab if there are "gaps / errors" in your initial simulation.

    5. analyze the data appropriately; include appropriate graphs, and show your work

    as mentioned earlier, the goal of this virtual laboratory activity is to determine the concentration of the simulated unknown acid and base.

     

    lab report format

    use Word (or google doc) and Excel (or google sheets)

    work in pair (or 3 students with prior teacher approval, since there might be an odd number of students in the class; attach a note stating that your group can have 3 students and you got prior teacher approval onto your lab report)