BCE

Last modified: Wed 12/31/1969 06:00:00 pm BCE

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Answer all of the questions below. If you do not know an answer enter CNA. However, it will help me the most if you answer each question with your best intuition/idea about what would be a reasonable answer.

First Name:

Last Name:

Laboratory Section:

In this BCE you will measure the pH of several aqueous solutions of acids and bases. You will watch a movie of a ph meter simulation developed at Iowa State University by Dr. Greenbowe and his students. Play the movie below. In the movie the concentrtion of each solution is set to 0.100 M. The beaker will be filled with 75 mLs of each solution in turn. You are to record the measured pH and then to calculate the [H⁺] for each measurement in the table below the movie.

1a. Complete the pH column in the following table.

Solution	pH	Equilibrium [H⁺] or [OH^-]
0.100 M HCl		[H⁺] =
0.100 M HNO₃		[H⁺] =
0.100 M H₂SO₄		[H⁺] =
0.100 M HC₂H₃O₂		[H⁺] =
0.100 M NaOH		[OH^-] =
0.100 M NH₃		[OH^-] =

b) Complete the Equilibrium [H⁺] or [OH^-] column by using the pH to calculate the [H⁺] or [OH^-] for each acid or base.

2a. Each of the acids in the table above has the same concentration, 0.100 M. Did all of the acids have the same pH? (Yes or No)

b) What do you think might be an explanation for the experimental pHs you observed for this set of acids.

3a. Each of the bases in the table above has the same concentration, 0.100 M. Did all of the bases have the same pH? (Yes or No)

b) What do you think might be an explanation for the experimental pHs you observed for this set of bases.

4. Is there anything about the questions that you feel you do not understand? List your concerns/questions.

5. If there is one question you would like to have answered in lecture, what would that question be?