Chem2 help

Experiment 2 MEASUREMENT

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Data Collection and Results Pages Name: __________________________

Date: ___________________

I. Length Measurement Size of smallest division ____________ Length of Rod A ___________________

II. Volume Measurement

50-mL beaker: TC, TD, Both or Neither ____________ Size of smallest division __________ 50-mL buret: TC, TD, Both or Neither ____________ Size of smallest division __________ 50-mL graduated cylinder: TC, TD, Both or Neither ____________ Size of smallest division __________ 100-mL graduated cylinder: TC, TD, Both or Neither ____________ Size of smallest division __________ 25-mL pipet: TC, TD, Both or Neither ____________ Tolerance __________ 100-mL volumetric flask: TC, TD, Both or Neither ____________ Tolerance __________ Measuring with a Beaker Volume of water in 50-mL beaker ______________ Volume transferred from beaker in 50-mL graduated cylinder _______________ Measuring with a Buret Initial buret reading _____________ Final buret reading ______________ Volume dispensed from buret ____________ Volume transferred from buret to 50-mL graduated cylinder ________________ Measuring with a Pipet Volume of water in 25-mL pipet _____________________ Volume transferred to 50-mL graduated cylinder _________________________ Measuring with a Volumetric Flask Tolerance of 100-mL volumetric flask _________________________________ Volume of water in 100-mL graduated cylinder __________________________ Is the bottom of the meniscus at, above, or below the line on the flask? ________

Experiment 2: MEASUREMENT

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III. Precision of Measuring Volumes Effect of Eye-Level on Accuracy of Reading Volumes

Meniscus At Eye-Level

Meniscus Above Eye-Level

Meniscus Below Eye-Level

Volume of Water

Assuming that the volume measured at eye-level is the correct value (7.00 mL), calculate the error in the volumes read above and below eye-level. (Show work.) Above eye-level: Below eye-level:

Eye-Level Meniscus Above Eye-Level Meniscus

Below Eye-Level Error

Precision of Volume Using Various Apparatus Type of Apparatus 10-mL grad cylinder 50-mL grad cylinder 50-mL beaker

Volume of Water

Give the number of decimal places you are able to record with each apparatus: Type of Apparatus 10-mL grad cylinder 50-mL grad cylinder 50-mL beaker

# of decimal places

Experiment 2: MEASUREMENT

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IV. Mass Measurement True Value ________________ Calculations In the space below, show calculations: Error Person 1) Person 2) % Error Person 1) Person 2)

Results Person 1 Person 2

Error

%Error