Title: The Effects of Carbon Dioxide on the pH of Water
Topic Introduction: Ocean Acidification is caused by excessive amounts of Carbon Dioxide that has been dissolved in the ocean water. Ocean acidification can adversely affect shelled organisms and their growth. Ocean acidification affects the growth of phytoplankton, which will harm the ocean food web.
Experimental Question:
How does carbon dioxide affect the pH of ocean water?
Pre-Lab Questions:
1: What gas are you blowing into the water?
A: Carbon Dioxide
2: What happens to the gas when you blow it into the water?
A: It dissolves.
3: How are you measuring change in the water during this lab?
A: We measured the pH level by the color using a universal indicator.
4: What does measuring the pH of the water tell us?
A: It shows how acidic the water is.
5: After studying the reactions above, how do you think carbonic acid will affect the pH of salt water?
A: The water will become more acidic.
Hypothesis: If I add Carbon Dioxide to salt water, then the pH level will increase.
Protocal:
Control Trial:
1. Add 100 ml saltwater to a 500 ml beaker.
2. Using a pipet, add 4 drops of universal indicator.
3. Record the initial color using the table on the data sheet.
4. Put plastic wrap over the top of the beaker to completely cover it, then insert a straw through the plastic.
5. Prepare to record the color of the solution every 30 seconds, using the Universal Indicator Color Chart.
6. Start timing for 2 minutes as the breather begins blowing.
7. At each 30 second interval, record the color of the solution.
8. Add your data to the table, convert color data to numbers, plot your data on the graph, and connect the points to create a line graph.
9. Now preform Protocal A, Protocal B, and Protocal C using the same procedure.
Data Table:
Color/ pH
0 seconds
30 seconds
60 seconds
90 seconds
120 seconds
Control
7.0
6.5
6.5
6.5
6.5
Tap
Cold Salt Water
Hot Salt Water
Analysis and Discussion of data:
1.
2.
3.
4.
Conclusion:
Shells Protocal
Topic Introduction: Ocean Acidification is caused by excessive amounts of Carbon Dioxide that has been dissolved in the ocean water. Ocean acidification can adversely affect shelled organisms and their growth. Ocean acidification affects the growth of phytoplankton, which will harm the ocean food web.
Experimental Question:
How does carbon dioxide affect the pH of ocean water?
Pre-Lab Questions:
1: What gas are you blowing into the water?
A: Carbon Dioxide
2: What happens to the gas when you blow it into the water?
A: It dissolves.
3: How are you measuring change in the water during this lab?
A: We measured the pH level by the color using a universal indicator.
4: What does measuring the pH of the water tell us?
A: It shows how acidic the water is.
5: After studying the reactions above, how do you think carbonic acid will affect the pH of salt water?
A: The water will become more acidic.
Hypothesis: If I add Carbon Dioxide to salt water, then the pH level will increase.
Protocal:
Control Trial:
1. Add 100 ml saltwater to a 500 ml beaker.
2. Using a pipet, add 4 drops of universal indicator.
3. Record the initial color using the table on the data sheet.
4. Put plastic wrap over the top of the beaker to completely cover it, then insert a straw through the plastic.
5. Prepare to record the color of the solution every 30 seconds, using the Universal Indicator Color Chart.
6. Start timing for 2 minutes as the breather begins blowing.
7. At each 30 second interval, record the color of the solution.
8. Add your data to the table, convert color data to numbers, plot your data on the graph, and connect the points to create a line graph.
9. Now preform Protocal A, Protocal B, and Protocal C using the same procedure.
Data Table:
Color/ pH
0 seconds
30 seconds
60 seconds
90 seconds
120 seconds
Control
7.0
6.5
6.5
6.5
6.5
Tap
Cold Salt Water
Hot Salt Water
Analysis and Discussion of data:
1.
2.
3.
4.
Conclusion:
Shells Protocal