Investigating the Law of Conservation of Mass
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Investigating the Law of Conservation of MassPurpose:The Purpose of this lab is to demonstrate that the mass of the reactants and products will stay the same which will prove that the Law of Conservation of Mass is real. Hypothesis:(Part A) If you mix the Sodium Hydroxide and Iron (III) Nitrate then the mass will stay the same because the Law of Conservation of Mass states that the mass of the reactants will always equal the mass of the product in a chemical change. (Part B) If you mix the water with the antacid tablet then the mass will also stay the same because the law of Conservation of Mass states that the mass of the reactants will always equal the mass of the product in a chemical change. Materials:Goggles BeakerFlaskTest tubeTest tube rackWeight BoatAlkaseltzer pill Sodium Hydroxide (5ml)Iron (III) Nitrate(3ml)ScaleTongsWater (50ml) Erlenmeyer FlaskProcedure:1. Goggles and aprons were put on.Part A: Iron (III) Nitrate and Sodium Hydroxide2. Practiced holding an empty test tube with tongs and slid it into an empty Erlenmeyer flask. Sealed the flask to check that the test tube fitted and that the stopper formed a tight seal.3. Measured 5ml of sodium hydroxide solution in the 10ml graduated cylinder. Poured that solution into the flask. 4. Poured the assigned volume of iron (III) nitrate solution into the small test tube.5. Flask was tilted and test tube was carefully slid into It. No content was spilled from test tube.6. Flask was sealed with stopper.7. Total mass of flask and its contents was measured and recorded. 8. Flask was slowly tipped to allow the two solutions to mix.9. Total mass of flask and its contents was measured and recorded.10. Flask and all its contents were returned to the teacher for disposal.Part B: Antacid Tablet in water11. 50ml of tap water was added to a plastic cup.12. The antacid tablet was taken out of its package. 13. Placed the tablet and the cup of water on a scale. Measured and recorded the total mass of the cup, water, and tablet.
14. Took the tablet and added it to the water. Recorded the observationS 15. Visible reaction stopped and the total mass of the cup and its contents were measured and recorded. Observations and Data:Part A: Sodium hydroxide and Iron (III) nitrate NaOH(Sodium Hydroxide)Fe(NO₃)₃ (aq) (Iron (III) Nitrate)Before ReactionAfter Reaction Quantitative Observations 5ml3mlTotal Mass=166.25gramsTotal Mass=166.25gramsQualitative Observations no colorTransparentLiquidorange color Transparent Liquid ——–Precipitate formsCopper color solidsTransparent liquidPart B: Tap water and Antacid TabletTap waterAntacid TabletBefore reactionAfter ReactionQuantitative Observation 50ml¼ TabletTotal Mass=170.1gramsTotal Mass=169.89gramsQualitative Observations ClearLiquidOdorlessSolidWhiteOpaque ——-Bubbles (gas was created)LiquidClearOdorlessAnalysis: 1. The mass for Part A stayed the same before and after the reaction because all the required equipment was available for us and measuring contents was extremely accurate. The mass of Part B however, was slightly off after the reaction because of the lack of lab equipment we were given, some gas from the reaction was released out of the cup and that resulted in a slightly different mass for after the reaction.