3. Calculate the pH of a solution that is 0.332 M in anilinium iodide.
Is anilinium an acid or a base?
After about ten minutes everyone should have the correct chemical equations representing this system. Some students may identify iodine as a spectator ion and some may write out the reaction of iodine with a proton. Some students may be tempted to say that the presence of HI will affect the acidity of anilinium.
What is the pH of this solution?
After about ten minutes the students should have all calculated a pH for this system. They should be able to identify this as a straightforward problem based on the procedure developed in problem 1. They may need to be reminded to use approximations.