Bags of Reactions Lab Essay Example for Free

Bags of Reactions Lab Essay* Problem/Purpose * Background Information The Law of Conservation of Mass was created by Antoine Lavoisier in the 18th century. This integrity give tongue to that flowerpot could consider could neither be created nor destroyed. During a reaction the bonds of the reactants ar broken and form new substances. As stated in the Law of Conservation, matter can neither be created nor destroyed because of this the products should have the same number and type of atoms as seen in the reactants. * Purpose Test the Law of Conservation of Mass. * supposition If we weight the mass of the materials before and after the reaction, then we can prove if the Law of Conservation of Mass is true.* Materials* Goggles* 25mL graduated cylinder* 2 resealable smashers* case* Antacid tablet* Scoopula* CaCl2 , Calcium Chloride* NaHCO3 , Sodium Hydrogen Carbonate* familiar Indicator* ProcedurePart A1. Measure 25mL of water and put into a resealable clasp. Flatten air out of the bag and seal it. Record the mass in slacken 1. 2. Record the mass of the antacid tablet in Table 1 3. Tip the bag sideways, and while holding the bag this way, add the tablet and water so not mix. Do not trap any extra air in the bag. Reseal the bag. 4. Let the tablet drop into the water. Observe the reaction until it comes to a complete stop. Record the observations. 5. When the reaction is complete, record the mass of the bag and its contents in Table 1. Part B6. Add two scoops of CaCl2 to the second bag 7. Add one scoop of NaHCO3 to the bag and bump around gently to mix. 8. Determine the mass of the bag and its contents. Record in Table 2. 9. Measure 25mL of water in a graduated cylinder. Add 10 drops of Universal Indicator to the water. 10. Tip the bag sideways, and while holding the solids in the upper leave of the bag, pour the water into the bag so the solids dont mix. 11. tutelage the trapped air to a minimum, reseal the bag. Hold the bag and let the liquid move from one end of the bag to the other until the contents are mixed. 12. Observe the reaction until it comes to a complete stop. Record your observations 13. Record the mass of the unopened bag in Table 2. Clean up your work and mop your hands before leaving the laboratory.* Data/ResultsTable 1 Antacid and WaterMass of bag and water 27.085gMass of tablet 3.21gMass of bag and reactants 30.305gMass of bag and products 28.14gTable 2 CaCl2, NaHCO3, and WaterMass of bag and dry reactants 4.09gVolume of water 25mLMass of water 24.925gTotal mass of bag and reactants 29.015gMass of bag and products 27.37g* Analysis/ConclusionA. Analysis Questions1. How do the values for the total mass before and after each reaction demonstrate the law of conservation of mass? The values seem to be in the same general value 2. What were three observations you made that indicated a reaction had occurred in part A? The tablet started to fizz, the bag began to fill with gas, and you could hear the tablet reacti ng with the water. 3. An indicator swaps color when the acidity of a solution changes. What evidence is there that such change occurred in Part B? The universal indicator changed to a yellowish orange color 4. Did the reaction in Part B become more(prenominal) acidic or basic? More acidicB. Conclusion The lab showed us that the Law of Conservation of Mass is correct. I feel that there were both(prenominal) mistakes in the lab. The size of the scale we were using was not large enough to fit the entire bag on for weighing. I feel that this affected the results we save for mass. If I were to redo this experiment I would be sure to use a bigger scale. I feel the data was also affected by extra air left in the bag. The results are close enough to show that the Law of Conservation of Mass is possible though when you take into accounts the caper we had with the lab.