Experiment 5: Empirical Formula General Chemistry I and II Lab Manual Dakota State University Page 85 of 232 Experiment 5: Empirical Formula Purpose: To determine the empirical formula of a hydrate Purr: Phrase uttered by happy cats everywhere. Background: See “Basic Laboratory Procedures”: Bunsen burner, balance Introduction: In the previous experiment, we made a hydrated compound. These compounds are excellent for demonstrating the principles of how mass can be used to determine empirical formula, because, provided the salt is stable enough, all you have to do is heat them up to drive off the water. The weight difference, then, between the hydrate and the anhydrous salt is the mass of the water. In essence, this is all we are really doing in today’s experiment. Procedure: VERY carefully, clean a crucible with a little bit of concentrated nitric acid. If all of the stains do not come out, don’t worry about it; after a nitric acid cleaning, nothing will come out anyway. Follow that by washing and drying the crucible. Place the crucible on an iron ring attached to a ring stand using a clay triangle.
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This note was uploaded on 01/27/2012 for the course CHM 2045 taught by Professor Josephwalter during the Fall '11 term at Dakota State.