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Follow the procedures below, answering the questions as you go. You will
be using the spreadsheet program, EXCEL, and possibly the internet, if
needed.
ACTIVITY TWO!
How are pH and [H+] related?
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Procedures and Questions
1. Obtain a list of common substances and their pH values. Your teacher
will explain the method you will use to obtain this list. Or click here
to go to an interactive
website where you can get this information.
2. Open EXCEL. Prepare a table with the following headings: Substance,
pH, H+ concentration.
3. Enter the substance and pH data into the table.
4. Determine how the H+ concentration can be found using the pH. Enter
an equation into the spreadsheet that will calculate the H+ concentration
for each substance in the table. (Remember: pH = -log [H+])
5. Predict the shape of a graph of pH versus H+ by making a sketch
in a box below. Label both axes of your sketched graph. Why do you think
the graph will look this way?
6. Use EXCEL to create a graph (scatter plot) of the pH versus the
H+ concentration. Be sure to include all labels, titles, etc.
7. Your graph should not have any loops or overlapping sections. WHY?
8. How could you get rid of the loops/overlaps if present in your graph?
9. Make a sketch of the graph you created in a box below. Include labels.
10. Look at the last 4 or 5 points on the graph. Why are they all crowded
near the bottom of the graph? Do they all show a H+ concentration of zero?
11. Create a second graph (scatter plot) using the last four data values
in the table only. (These will be the four values with the highest pH.)
12. Make a sketch of the graph in a box below. Include labels.
13. Why did the shape of the graph of these last 4 or 5 points change
from a basically horizontal line on the first graph to a curve on the second
graph?
14. Last Question-but the Most Important! In your own words, explain
the relationship between pH and H+ concentration. Support your conclusions
using data/information obtained by completing this activity. (Include in
your answer the significance of the shape of the graphed line.) |
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