Objectives:
• Describe how acids and alkali can cancel each other out
• Demonstrate that the pH color changes during neutralization
Testable Question:
Does the concentration of an acid/alkali affect how fast neutralization happens?
Materials and Apparatus:
MATERIALS APPARATUS
HCl (0.1 mol) 2 test tubes
NaOH (0.1 mol) test tube rack
NaOH (1 mol) 3 droppers
Universal Indicator
safety goggles
White board marker
Variables:
Independent:
HYDRO CHLORIC ACID.
Dependent:
HOW FAST THE ACID WILL TURN NEUTRAL.
Controlled:
SODIUM HYDROXIDE.
Class Hypothesis:
The 1 MOL Sodium hydroxide will make the hydro chloric acid change into a neutral substance first because the 1 MOL is more concentrated than the 0.1 MOL.
Procedure:
1. Using the white board marker, label the test tubes 1 and 2.
2. Using the dropper, measure 1ml of HCl and put it in the test tube. Put 2 drops of universal indicator. Do the same for the other test tube.
3. Put some NaOH (0.1 mol) into the other dropper.
4. At this point, you may start documenting your experiment.
5. Count the number of drops it takes to neutralize the HCl in test tube 1. MAKE SURE TO GENTLY SHAKE THE TEST TUBE AFTER EVERY DROP! Record your results.
6. Using another dropper, take some NaOH (1 mol). Repeat step 4.
RESULTS AND OBSERVATIONS:
Complete the table:
Chemical # of drops
NaOH (0.1 mol) 17
NaOH (1 mol) 5
• Describe how acids and alkali can cancel each other out
• Demonstrate that the pH color changes during neutralization
Testable Question:
Does the concentration of an acid/alkali affect how fast neutralization happens?
Materials and Apparatus:
MATERIALS APPARATUS
HCl (0.1 mol) 2 test tubes
NaOH (0.1 mol) test tube rack
NaOH (1 mol) 3 droppers
Universal Indicator
safety goggles
White board marker
Variables:
Independent:
HYDRO CHLORIC ACID.
Dependent:
HOW FAST THE ACID WILL TURN NEUTRAL.
Controlled:
SODIUM HYDROXIDE.
Class Hypothesis:
The 1 MOL Sodium hydroxide will make the hydro chloric acid change into a neutral substance first because the 1 MOL is more concentrated than the 0.1 MOL.
Procedure:
1. Using the white board marker, label the test tubes 1 and 2.
2. Using the dropper, measure 1ml of HCl and put it in the test tube. Put 2 drops of universal indicator. Do the same for the other test tube.
3. Put some NaOH (0.1 mol) into the other dropper.
4. At this point, you may start documenting your experiment.
5. Count the number of drops it takes to neutralize the HCl in test tube 1. MAKE SURE TO GENTLY SHAKE THE TEST TUBE AFTER EVERY DROP! Record your results.
6. Using another dropper, take some NaOH (1 mol). Repeat step 4.
RESULTS AND OBSERVATIONS:
Complete the table:
Chemical # of drops
NaOH (0.1 mol) 17
NaOH (1 mol) 5
- Guide Questions:
1. Did the results of the experiment support your hypothesis? Why or why not?
- Yes, the stronger the sodium hydroxide is, the less drops we need to put.
2. Why was it important to shake the acidic solution and look at it after every drop of the alkaline solution?
If you don't shake the acid that has alkali in it, the chemical will not be mixed together and we will need more drops than needed
3. On a scale of 1 to 5, 5 being the best, rate your participation in this investigation and explain why.
- 4, because our dropper broke, we didn't complete the experiment.
4. On a scale of 1 to 5, 5 being the best, rate your other 2 group members’ participation in this investigation and explain why.
- 4,because when we did some part like shaking the test tube, she will always ask me to do it.
5. How can you improve this experiment? (talk about the procedure or the materials, not about your participation)
GET A BETTER DROPPER!!!