Monday, December 7, 2009

Chromatography: Ions

How do we figure out which ions require no development?

Thursday, December 3, 2009

Percent Yield?

Does anyone know how to find the theoretical and percent yield? or what she actually asked for?

Post Lab: #1

I answered that usually there is no direct way to determine the molecular formula of a substance from its percent composition. This is shown in C2H4, where it technically have the same percentage composition as C4H8 but still is a different molecule with diffrent properties. However, for some molecules such as water, a substance H4O2 does not exist, so the percentage composition would be able to be used to determine the molecular formula.

Anyone able to agree with this or disagree?