Lab 7.docx - Determination of Percent by Mass of NaHCO3 in...

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Determination of Percent by Mass of NaHCO3in Alka-Seltzer TabletsAbstractThe purpose of this lab is to determine the amount of sodium bicarbonate in Alka-Seltzerstablets by measuring the amount of CO2produced from the acid-base reaction of bicarbonatewith acetic acid. The chemical principles of the lab include stoichiometry and its applications,percent by mass, and the concept of limiting reagents.ProcedureMeasure 35 mL of distilled water into a clean 250 mL beaker. Then, weigh and record thetotal mass of the beaker plus water as well as the actual measured volume of the water. Next,weigh and record the mass of one Alka-Seltzer® tablet and drop the tablet into the beaker. Swirlcarefully until the acid-base reaction is complete, which is apparent when bubbling ceases.Weigh the beaker again with the dissolved solution and record this mass. Rinse the beaker withdistilled water. Then repeat steps 1-3 using 5 mL of vinegar + 30 mL water, then with 10 mLvinegar + 25 mL water, and so on, increasing the volume of vinegar by 5 mL each time whilekeeping the total volume of the solution at 35 mL.Make sure to record your data in the sampletable. Finally, calculate the mass of CO2(g)generated for each run and record the amount in thetable. All solutions can be diluted with water and disposed of down the sink.Data Table & ObservationsRunVolume of Vinegar (mL)Volume of Water (mL)103525303102541520520156251073058350
RunVolume (mL)Mass (g)Mass ofNaHCO3%NaHCO3in TabletVinegarWaterBeaker +Vinegar/WaterTabletMass BeforeReactionMass AfterReactionCO2Formed1035.2133.923.27137.19136.340.851.6249.525.129.5136.133.24139.37138.440.931.7854.8310.224.8133.503.26136.76135.651.112.12

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Term
Spring
Professor
N/A
Tags
Stoichiometry, Mass of NaHCO3

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