Lab002exp0011
Experiment 1: Neutralization of Acids and Bases
In this experiment, you will learn how to properly neutralize and dispose of acidic and basic solutions.
Materials
5 mL 4.5% Acetic Acid (vinegar), C2H4O2
(1) 10 mL Graduated Cylinder
8 Litmus Test Strips (Neutral)
Permanent Marker
2 Pipettes
1 g Sodium Bicarbonate (baking soda), NaHCO3 4 Weigh Boats
*Water
*You Must Provide
Procedure
1. Use the permanent marker to label three of the weigh boats as A - C.
2. Measure and pour approximately 5 mL of water into weigh boat "A".
3. Add 0.5 g sodium bicarbonate to weigh boat "B".
4. Measure and pour approximately 5 mL of water into weigh boat "B". Gently pipette the solution up and down until the sodium bicarbonate is fully dissolved in the water.
5. Measure and pour 5 mL acetic acid solution to weigh boat "C".
6. Use the litmus test strips to determine if the substances in weigh boats A - C are acidic or basic. This is accomplished by briefly dipping an unused strip of the litmus paper in each of the weigh boats. Record your color results in Table 2.
7. Pipette 1 mL of the sodium bicarbonate solution from weigh boat "B" into weigh boat "C". Gently swirl weigh boat "C" to mix.
8. Develop and record a hypothesis regarding the pH of weigh boat “C”. Record this in the Post-Lab Questions section.
9. Test the pH of weigh boat "C" using new litmus paper. Record your result in Table 3.
10. Repeat Step 9 four more times until all the sodium bicarbonate has been added to weigh boat “C”.
Table 2: Initial Litmus Test Results
Weigh Boat
Chemical Contents
Litmus Results
Additional Observations
A
Water 7 Slightly green/purple
B
Sodium Bicarbonate 9 Blue
C
Vinegar 3 Orange
Table 3: Neutralization of an Acid
Amount of Base
Litmus Result
1 mL
Little to no change
2 mL Slightly lighter-4
3 mL About the same, slightly lighter
4 mL The color of the paper 5
5 mL Looks slightly green 6
Post-Lab Questions
1. State your hypothesis (developed in Step 8) here. Be sure to
In this experiment, you will learn how to properly neutralize and dispose of acidic and basic solutions.
Materials
5 mL 4.5% Acetic Acid (vinegar), C2H4O2
(1) 10 mL Graduated Cylinder
8 Litmus Test Strips (Neutral)
Permanent Marker
2 Pipettes
1 g Sodium Bicarbonate (baking soda), NaHCO3 4 Weigh Boats
*Water
*You Must Provide
Procedure
1. Use the permanent marker to label three of the weigh boats as A - C.
2. Measure and pour approximately 5 mL of water into weigh boat "A".
3. Add 0.5 g sodium bicarbonate to weigh boat "B".
4. Measure and pour approximately 5 mL of water into weigh boat "B". Gently pipette the solution up and down until the sodium bicarbonate is fully dissolved in the water.
5. Measure and pour 5 mL acetic acid solution to weigh boat "C".
6. Use the litmus test strips to determine if the substances in weigh boats A - C are acidic or basic. This is accomplished by briefly dipping an unused strip of the litmus paper in each of the weigh boats. Record your color results in Table 2.
7. Pipette 1 mL of the sodium bicarbonate solution from weigh boat "B" into weigh boat "C". Gently swirl weigh boat "C" to mix.
8. Develop and record a hypothesis regarding the pH of weigh boat “C”. Record this in the Post-Lab Questions section.
9. Test the pH of weigh boat "C" using new litmus paper. Record your result in Table 3.
10. Repeat Step 9 four more times until all the sodium bicarbonate has been added to weigh boat “C”.
Table 2: Initial Litmus Test Results
Weigh Boat
Chemical Contents
Litmus Results
Additional Observations
A
Water 7 Slightly green/purple
B
Sodium Bicarbonate 9 Blue
C
Vinegar 3 Orange
Table 3: Neutralization of an Acid
Amount of Base
Litmus Result
1 mL
Little to no change
2 mL Slightly lighter-4
3 mL About the same, slightly lighter
4 mL The color of the paper 5
5 mL Looks slightly green 6
Post-Lab Questions
1. State your hypothesis (developed in Step 8) here. Be sure to