Density and Treatment of Data.pdf - Density and Treatment...

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Density and Treatment of DataChemistry 1A Spring 2019 February 14, 2019Objective/abstractThe purpose of this experiment is to understand how to perform statistical analysis ofexperimental data. We will determine the density of a solid, calibrate the volume of apipette and use the calibrated pipette to determine the density of an unknown liquid.TheoreticalverageA=3x+x+x123angeR=W=xx(largestsmallest)eviationδxxD=1=1verageDeviationδA==3δ+ δ+ δ|1| |2| |3|tandardDeviationsS==3−1δ+ δ+ δ212223ensityD=mVPre-lab Sections:Experimental Procedure and MSDS InformationPart 1 :Determination Of the density of a metal(a)Obtain A metal slug and use analytical balance to measure its mass(b) Fill a 100mLgraduated cylinder halfway andrecord volume to nearest 0.1 mL.(c)Tie the metal slug with a string and carefully drop it into the 100 mL graduatedcylinder. Avoid splattering.(d) Repeat the procedure two more times. Use the same mass recorded in step (a)above.
Part 2: Calibration of pipets(a)Use the analytical balance to weigh a clean and dry 50 mL Erlenmeyer flask witha stopper to ± 0.0001 g.(b) Pipet 10 mL of deionized water into the weighted flask/stopper.(c)Weighthe Erlenmeyer flask and its contents to ± 0.0001 g.(d) Using the addition method, repeat this procedure two more times.In the additionmethod, we subtract the previous mass reading to obtain the mass of the water foreach trial.(e)Determine the temperature of the water to ± 0.1 C and look up the density in theHandbook. Record the density of water and calculate the volume corresponding toone aliquot of the 10mL pipette.

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