Data Table 4 Number of Added Drops pH of Non-Buffer Solution (Water) pH of Buffer Solution 0 7.00 7.00 1 11.78 7.04 2 12
Posted: Tue Jul 05, 2022 7:41 am
Data Table 4
Number of Added Drops
pH of Non-Buffer Solution
(Water)
pH of Buffer Solution
0
7.00
7.00
1
11.78
7.04
2
12.08
7.08
3
12.26
7.12
4
12.38
7.16
5
12.58
7.20
Observations and Questions
[8] What happens to the pH of the water as you add drops of thebase solution (Data Table 4)? What is the chemical basis of thischange in the pH of the water as base is added?
[9] Calculate the percent change of pH for water using theformula below.
Percent Change of pH = 100% x ( pH at 5 drops - pH at 0 drops )/ ( pH at 0 drops )
[10] Calculate the percent change of pH for the buffer using theformula below.
Percent Change of pH = 100% x ( pH at 5 drops - pH at 0 drops )/ ( pH at 0 drops )
[11] The buffer solution is said to “resist” a change in pH.Compare the percentage changes for the water solution and thebuffer solution. Do these percentages support a resistance tochange for the buffer solution? Explain your answer.
[12] In your own words, explain the chemical basis of how thebuffer resists pH changes when the base is added.
[13] Design an experiment testing the impact of different pHlevels on plant growth. What would be the levels of yourindependent variable? Be specific. You would need to vary the pH ofa factor that plants need for growth such as soil, fertilizer, orwater. What would be your dependent variable; that is, what resultwould you measure?
Number of Added Drops
pH of Non-Buffer Solution
(Water)
pH of Buffer Solution
0
7.00
7.00
1
11.78
7.04
2
12.08
7.08
3
12.26
7.12
4
12.38
7.16
5
12.58
7.20
Observations and Questions
[8] What happens to the pH of the water as you add drops of thebase solution (Data Table 4)? What is the chemical basis of thischange in the pH of the water as base is added?
[9] Calculate the percent change of pH for water using theformula below.
Percent Change of pH = 100% x ( pH at 5 drops - pH at 0 drops )/ ( pH at 0 drops )
[10] Calculate the percent change of pH for the buffer using theformula below.
Percent Change of pH = 100% x ( pH at 5 drops - pH at 0 drops )/ ( pH at 0 drops )
[11] The buffer solution is said to “resist” a change in pH.Compare the percentage changes for the water solution and thebuffer solution. Do these percentages support a resistance tochange for the buffer solution? Explain your answer.
[12] In your own words, explain the chemical basis of how thebuffer resists pH changes when the base is added.
[13] Design an experiment testing the impact of different pHlevels on plant growth. What would be the levels of yourindependent variable? Be specific. You would need to vary the pH ofa factor that plants need for growth such as soil, fertilizer, orwater. What would be your dependent variable; that is, what resultwould you measure?