Blast Off! Lab # 4 Purpose: To design an experiment to test several variables that affect the build up of gas in the closed canister.
Hypothesis: I think that we will have to adjust the amount of water to control the speed of the reaction.
Materials: ÃÂÃÂ· Apron ÃÂÃÂ· Safety Goggles ÃÂÃÂ· 4 Alka-Seltzer Tablets ÃÂÃÂ· 2 Plastic Film Containers (with lids) ÃÂÃÂ· Water ÃÂÃÂ· Stop Watch or Timer ÃÂÃÂ· Graduated Cylinder Procedure: Step 1. Put on apron and Safety goggles.
Step 2. Get Alka-Seltzer tablets and plastic film container from teacher.
Step 3. Measure x ml of distilled water with the graduated cylinder and pour it into the film container.
Step 4. Drop x grams of Alka-Seltzer into the film container and close lids quickly.
Step 5. Wait for reaction and record time and amount of water and Alka-Seltzer on the observation chart.
Step 6. Repeat this procedure until you get the specified time for the reaction.
Step 7. When you have reached this point perform the experiment several more times with the same amount of everything to see if the reaction takes the same amount of time.
Trial Number Amount of Alka-Seltzer (g) Amount of Water (Ml) Time of "Blast off"ÃÂ(Seconds) Next Step 1 1.2 25 16 1 ml more water 2 1.2 26 15 None 3 1.2 27 13 1 ml less water 4 1.2 26 15 None 5 1.2 26 15 None Conclusion: In conclusion the reaction was controlled by the amount of water and also the amount of Alka-Seltzer mixed together.
Error Analysis: No human or experimental errors made.
Analysis Question: I would have tried to control the experiment more by trying different methods such as temperatures and amount of Alka-Seltzer tablets.