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September 2, 2015

Homework Help: chemistry

Posted by Jen on Sunday, September 27, 2009 at 9:03pm.

this is a question for a lab experiment...in the lab we got 2 empty vials and were supposed "eyeball" 1.0g of NaCl into each of the vials using a vial with NaCl in it already as a sample. Then we weighed the filled vials on analytical balance and recorded weight. Then we emptied the vials and weighed them on the analytical balance.
The question is:
why is the "empty" vial weighed after pouring the sodium chloride out of the vial, instead of before putting the sodium chloride into the vial?

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