Determination of a Chemical Formula Gravimetric Analysis and
- Slides: 6
Determination of a Chemical Formula Gravimetric Analysis and Percentage Composition
The Big Picture Hydrates are compounds that have water molecules as part of the crystal structure. . Cu. SO For example… 4 5 H 2 O Copper(II) sulfate pentahydrate Often, it is easy to remove the bound water molecules by simply heating. Cu. SO 4 5 H 2 O Copper(II) sulfate pentahydrate. D Cu. SO 4 + Copper(II) sulfate (anhydrous) 5 H 2 O
Overview Gravimetric Analysis = Analysis by Mass Part 1 Compound under study is Mg. SO 4. x. H 2 O (a hydrate) Your assignment: Determine x Indirect determination Part 2 Substance under study is a mixture of Na. Cl and Mg. SO 4. x. H 2 O Now you know x Your assignment: Determine percentage Mg. SO 4. x. H 2 O Na. Cl unaffected by heat
• List of Materials • Include Unknown Mixture ID • READ pages 21 -22 • If you heat something, it gets hot!! • Do not place hot crucibles on notebooks or bench top • Please, reread the previous sentence • Calculations • You must show in detail how you will treat your data formula determination and unknown mixture— suggest selecting sample data and working through a calculation • Never weigh a hot crucible! • Each group member must sign and print name
Author Assignments This investigation, Author 2: Introduction and Conclusion 3: Discussion 1: Data/Results and Experimental This investigation, Author A: Introduction, Conclusion, Data/Results B: Discussion and Experimental
