report - Rajagopalan 1 Data and Results A Balance Use When...

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Rajagopalan Data and ResultsA.Balance Use: When is a Gram a Gram?Table 1. General Data from Part ATable 2. Variation in Mass Across Packets of SweetenerTable 3. Variation in Mass Across BalancesB.Measuring LiquidsTable 4. Precision of Graduated Cylinders of Various VolumesNominal mass of sweetener (g)1Mass of empty packet (g)0.251Number of single balance3Packet No.Mass of Contents +Packet (g)Calculated Mass ofContents (g)Percent Error (%)11.3251.0747.421.2561.0050.531.3131.0626.241.3221.0717.151.2711.022Mean (g):1.046Standard Deviation (g):0.0317BalanceNo.Mass of Contents +Packet (g)Calculated Mass ofContents (g)Percent Error (%)11.3231.0727.221.3231.0727.231.3251.0747.441.3221.0717.151.3271.0767.6Mean (g):1.073Standard Deviation (g):0.002Cylinder SizeSmallest Graduation (ml)Estimated Precision (ml)250.50.2510010.51000105Water Temperature (ºC):24Water Density (g/ml):0.9971
Rajagopalan Table 5. Water Delivered by 10 ml Graduated CylinderTable 6. Water Delivered by 10 ml Serological PipetteTable 7. Water Delivered by a 10 ml Volumetric PipetteC.Quantitative Solution MakingTable 8. Concentration and Absorbance Measurements for Diluted Kool-Aid Plot 1. Absorbance versus Concentration for Kool-Aid SolutionsNominal Volume ofWater (ml)Mass of Beaker andWater (g)Mass of WaterDelivered (g)Calculated Volumeof Water Delivered(ml)048.8921058.89410.00210.0322069.11610.22210.2533079.24410.12810.158Mean (ml):10.148StandardDeviation (ml):0.11086Nominal Volumeof Water (ml)Mass of Beaker andWater (g)Mass of WaterDelivered (g)Calculated Volumeof Water Delivered(ml)049.0681058.8839.8159.8152068.6589.7759.7753078.4829.8249.824Mean (ml):9.834Standard Deviation(ml):0.02665Test TubeVolume of Stock (ml)Volume of Water (ml)[Kool-Aid](mol/L)Absorbance1142.00E-050.0612234.00E-050.1223326.00E-050.2354418.00E-050.2675501.00E-040.3012
Rajagopalan D.Sample Data1.Concentration of Kool-Aid solution made in 100 mL volumetric flask0.100 g Kool-Aid = 1 x 10-5 mol Kool-Aid10,000 g/mol Kool-AidM= mol/L = 1 x10-5=0.1Lb)Concentration of solution in test tube M1V1= M2V2(1 x 10-4mol/L)(0.001 L) = M2(0.005 L)DiscussionThe objective of Part A was to recognize the different factors that affect the precision of ameasurement as well as to determine what level of significance students should report their data. Table 2 displays the mass in grams of five unopened packets of sweetener on a single

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