Q2 CFA (
NGSS SEP 3,4,5,7,8 CC 2)
Name: ________________
The Experiment: Your lab has received shipments of an “acid” rain sample in a test tube. As a lab tech, you are trying to
determine which anti-acid solution is the most effective at neutralizing acid rain. You will know that the acid rain has
neutralized, if it changes colors.
Background: Bromthymol Blue (BB) is an indicator of basic and neutral solutions. Adding BB to your acid rain sample will turn it blue.
Adding the anti-acid solution to the acid rain and BB will turn the solution yellow, if the solution has neutralized. Neutralization means
the acid rain is not a public health hazard.
Purpose: (2pts) _____________________________________________________________________
Hypothesis: (4pts) Circle the independent variable; underline the dependent variable.
________________________________________________________________________________
________________________________________________________________________________
Equipment: Goggles, Glass Dish, Stir Stick, Water Jug, Paper Towels, Bromthymol Blue Bottle, Acid Rain Test Tube,
Anti-acid Squeeze Bottle 1, Anti-acid Squeeze Bottle 2, Anti-acid Squeeze Bottle 3, Anti-acid Squeeze Bottle 4
SAFETY: Please do not inhale any of the samples. Waft odors.
Please wear goggles at all times!!!
Procedure: (Use as steps as you need! Please provide specific details! )
(6 pts)
1. ______________________________________________________________________________
2. ______________________________________________________________________________
3. ______________________________________________________________________________
4. ______________________________________________________________________________
5. ______________________________________________________________________________
6. ______________________________________________________________________________
***If the solution has not neutralize after 25 drops, you may record a + 25 drops for your data and move on.
Data Table (2 pts)
Anti-Acid squeeze Bottle 1
Anti-Acid Squeeze Bottle 2
Anti-Acid Squeeze Bottle 3
Anti-Acid Squeeze Bottle 4
Trial 1: # of drops
to neutralize acid rain
Trial 2: # of drops
to neutralize acid rain
Trial 3: # of drops
to neutralize acid rain
Average # of drops
To neutralize acid rain.
*** You may round to the nearest whole number.
Graph the average # of anti-acid drops. (4pts) Title: ______________________________________
Conclusion A: What is your claim about the hypothesis? (1 pt)
________________________________________________________________________________
________________________________________________________________________________
Conclusion B: Do you have evidence to support your claim? (4 pts)
Report the avg. results of each anti-acid bottle. Use data numbers in your sentences!
________________________________________________________________________________
________________________________________________________________________________
________________________________________________________________________________
________________________________________________________________________________
________________________________________________________________________________
________________________________________________________________________________
________________________________________________________________________________
________________________________________________________________________________
Conclusion C: Analyze your results. Answer each question.
(2 pts)
* Is your evidence reliable? If you were asked to repeat the experiment, would the new results be very
close of your original experiment’s results? Explain your answer.
* Were there any errors in the experiment that may have affected the results?
If yes, explain how the mistake may have affected the results.
________________________________________________________________________________
________________________________________________________________________________
________________________________________________________________________________
________________________________________________________________________________
________________________________________________________________________________
________________________________________________________________________________
25=A
24=A
23=A- 22=B+
21=B 20=B- 19=C
18=C 17=D+