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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