Name:
Date:
Pd:
Factors that Affect the Rate of Reaction Lab
Experiment 1: The Effects of Temperature on Rate of Reaction
Hypothesis:
Predict the order in which you believe the Alka-Seltzer will dissolve the fastest tablets between
hot water, room temperature water, and cold water.
______________________________________________________________________________
______________________________________________________________________________
Materials:



Beakers
3 tablets
Water- same amount
Thermometer
Stopwatch
Ice cubes
Procedure:
A. Hot Water
1. Run water from the hot tap until it is as hot as possible. Fill a beaker with 60.mL of hot water.
2. Use the thermometer to take the temperature and record it on your data sheet.
3. Remove tablet from its package. Drop it into water. Measure the time required for tablet to
fully dissolve. Be prepared to start and stop on time. Record the time.
4. Rinse out beaker and use for part B.
B. Room Temperature Water
1. Fill a beaker with 60.mL of room temperature or lukewarm water.
2. Use the thermometer to take the temperature and record it on your data sheet.
3. Drop 1 tablet into the water. Measure the time required for the reaction to be completed.
Record the time.
4. Rinse out beaker and use for part C.
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Name:
C. Cold Water
Date:
Pd:
1. Fill a beaker with 40mL. of water and add enough ice to adjust the level to 60mL. Stir the ice
water for about 15 seconds so the temperature will come to equilibrium.
2. Use the thermometer to take the temperature and record it on your data sheet. (Leave the
ice cubes in the water!)
3. Drop 1 tablet into the water. Measure the time required for the reaction to be completed.
Record the time.
4. Rinse out beaker.
Data/Observations:
Type of Water
Water
Temperature
(degrees C)
Observations During
Reaction
Time for Reaction to be
Completed (Seconds)
Hot Tap Water
Room Temperature
Water
Ice Water
Analysis:
Graph your data points on graph paper using water temperature (y-axis) vs. time to fully
dissolve (x-axis) to show the effect of temperature on Rate of Reaction. Use your graph to help
answer the questions below.
Conclusion Summary:
How does temperature affect the rate of reaction?
______________________________________________________________________________
______________________________________________________________________________
Questions:
1. At a temperature of 10 degrees C, it would take _________ seconds for 1 tablet to react with
60 .mL of water.
2. If the temperature is doubled from 20 degrees C to 40 degrees C, the time for the rate of
reaction __________by approximately ___________.
3. Using hot tap water, the rate was ___________ times faster than at 0 degrees C.
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Name:
Date:
Pd:
Factors that Affect the Rate of Reaction Lab
Experiment 2: The Effect of Particle Size on Rate of Reaction
Hypothesis:
Predict the order in which you believe the tablets will dissolve the fastest between a whole
tablet, a tablet broken into 4 pieces, a tablet broken into 8 pieces.
______________________________________________________________________________
______________________________________________________________________________
Materials:



Beaker
3 tablets
Stopwatch
Procedure:
A. Whole Tablet
1. Fill a beaker with 60.mL of room temperature or lukewarm water.
2. Drop 1 whole tablet into the water. Measure and record the time to dissolve.
3. Rinse out beaker and use for part B.
B. Tablet Broken into ~4 Pieces
1. Place 1 tablet onto a sheet of paper and break into approximately 4 pieces of about equal
size.
2. Fill a beaker with exactly 60.mL of room temperature or lukewarm water.
3. Slide broken tablet into the water from the sheet. Measure and record the time to dissolve.
4. Rinse out beaker and use for part C.
C. Tablet Broken into ~8 Pieces
11. Place 1 tablet onto a sheet of paper and break into approximately 4 pieces of about equal
size.
2. Fill a beaker with exactly 60.mL of room temperature or lukewarm water.
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Name:
Date:
Pd:
3. Slide broken tablet into the water from the sheet. Measure and record the time to dissolve.
4. Rinse out beaker and use for part C.
Data/Observations:
Particle Size
Observations During Reaction
Time for Reaction to be
Completed (Seconds)
Whole Tablet
4 Pieces
8 pieces
Analysis:
Graph your data on graph paper using particle size (y-axis) vs. time to fully dissolve (x-axis) to
show the effect of particle size on Rate of Reaction. Use your graph to help answer the
questions below.
Conclusion Summary:
a) As particle size decreases, the rate of reaction __________________.
b) The rate of reaction for the smallest pieces was ___________ times faster than for the
whole tablet.
Questions:
1. As particle size decreases, the total surface area of a reactant ________________. As a
result, the probability of interactions between atoms/ions ________________, and the rate of
reaction ___________________.
2. Particle size appears to have _______________ (less or more) of an effect on the rate of
reaction than temperature.
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Name:
Date:
Pd:
Factors that Affect the Rate of Reaction Lab
Experiment 3: Effect of Concentration of the Reactants
Hypothesis:
Predict the order in which you believe the tablets will dissolve the fastest between 100%
vinegar, 66.7% vinegar, and 33.3% vinegar.
______________________________________________________________________________
______________________________________________________________________________
Materials:
 Beakers
 Vinegar
 3 Tablets
 Water
 Stopwatch
Procedure:
1. Make your 100% vinegar solution by measuring out 60mL of vinegar.
2. Make your 66.7% vinegar solution by measuring 40mL of vinegar and 20mL of water .
3. Make your 33.3% vinegar solution by measuring 20mL of vinegar and 40mL of water.
4. Drop the tablet in, record observations and time to dissolve.
5. Repeat step 4 for the remaining 2 concentrations.
Data/Observations:
Concentrations of Vinegar
Observations During Reaction
Time for Reaction to be
Completed (Seconds)
100% Vinegar
60% Vinegar
20% Vinegar
Analysis:
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Name:
Date:
Pd:
Graph your data on graph paper using concentration (y-axis) vs. time to fully dissolve (x-axis) to
show the effect of concentration on Rate of Reaction. Use your graph to help answer the
questions below.
Conclusion Summary:
How does concentration affect the rate of reaction?
______________________________________________________________________________
______________________________________________________________________________
Questions:
1. Why does 100% vinegar react more quickly with the tablet?
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