Lab: Reaction Rate
Purpose:
To see how different variables affect the rate of reaction of antacid tablets in water
Question:
How does the temperature and particle size of an antacid tablet affect the rate of reaction?
Hypothesis:
Part 1
If you increase the temperature of a reaction, then the reaction rate will increase because
particles experience more collisions at higher temperatures.
Part 2
If you decrease the particle size of a reactant, then the reaction rate will increase because more
of the reactants’ molecules will contact each other.
Variables:
Part 1
the particle size reaction rate temperature was the
independent variable and the surface area reaction rate temperature
was the dependent variable.
Part 2
The particle size reaction rate temperature was the
independent variable and the surface area particle size reaction rate temperature was the
dependent variable.
Materials:
Water
Antacid tablets
Beaker
Hot plate
Ice cubes
Tongs
Thermometer
Hammer
Procedure:
Part 1
First the beaker would be filled with .2 mL of water. Then water would be heated up on a
hot plate or cooled down with ice cubes. The temperature would then be measured with
a thermometer. After this the antacid tablet would be placed in the water and the
stopwatch would be started. The time that it took the antacid to be dissolved completely
would be recorded and then the next set of experiments would be done.
Part 2
First the beaker would be filled with .2 mL of water. Then the antacid tablet would be left
alone broken into pieces or crushed into a powder. After this the antacid tablet would be
placed in the water and the stopwatch would be started. The time that it took the antacid
to be dissolved completely would be recorded and then the next set of experiments
would be done.
Data:
Temp.
Mass of tablet
Volume
Reaction time
Reaction rate
5C
1000 mg
.2 mL
138
36 mg/L/sec
20 C
1000 mg
.2 mL
34
146 mg/L/sec
40 C
1000 mg
.2 mL
26
190 mg/L/sec
65 C
1000 mg
.2 mL
14
352 mg/L/sec
Particle size
Mass of tablet
Volume
Reaction time
Reaction rate
Full
1000 mg
.2 mL
34
145 mg/L/sec
Broken
1000 mg
.2 mL
28
173 mg/L/sec
Crushed
1000 mg
.2 mL
23
216 mg/L/sec