Experimental Procedure
A. Mass of a Coin
After you have been shown how to operate the analytical balances in your laboratory, read the section on balances in Appendix IV. Take a coin and measure its mass to 0.0001 g. Record the mass on the Data page. If
your balance has a TARE bar, use it to re-zero the balance. Take another coin and weigh it, recording its mass.
Remove both coins, zero the balance, and weigh both coins together, recording the total mass. If you have no
TARE bar on your balance, add the second coin and measure and record the mass of the two coins. Then
remove both coins and find the mass of the second one by itself. When you are satisfied that your results are
those you would expect, go to the stockroom and obtain a glass-stoppered flask, which will serve as a pycnometer, and samples of an unknown liquid and an unknown metal.
Experimental Procedure
A. Mass of a Coin
After you have been shown how to operate the analytical balances in your laboratory, read the section on balances in Appendix IV. Take a coin and measure its mass to 0.0001 g. Record the mass on the Data page. If
your balance has a TARE bar, use it to re-zero the balance. Take another coin and weigh it, recording its mass.
Remove both coins, zero the balance, and weigh both coins together, recording the total mass. If you have no
TARE bar on your balance, add the second coin and measure and record the mass of the two coins. Then
remove both coins and find the mass of the second one by itself. When you are satisfied that your results are
those you would expect, go to the stockroom and obtain a glass-stoppered flask, which will serve as a pycnometer, and samples of an unknown liquid and an unknown metal.
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