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Experiment 8: Gravimetric Analysis

Experiment 8: Gravimetric Analysis. (On handout). Purpose of This Experiment. To determine the identity of an unknown sample Work in groups of 2, each group gets 1 unknown sample. Today in Lab. Use the scoop provided to remove solid material from the reagent bottle.

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Experiment 8: Gravimetric Analysis

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  1. Experiment 8: Gravimetric Analysis (On handout) CHE116 Fall 2012

  2. Purpose of This Experiment • To determine the identity of an unknown sample • Work in groups of 2, each group gets 1 unknown sample CHE116 Fall 2012

  3. Today in Lab • Use the scoop provided to remove solid material from the reagent bottle. • Weigh one aliquot of the unknown sample, perform the analysis, and then repeat the experiment for trial 2. Trial 3 may have to be done at the same time as trial 2, depending on time. • Do the calculations for trial 1 before you begin trial 2 and trial 3. CHE116 Fall 2012

  4. General Approach to Experiment • The unknown sample will be either Li2CO3, Na2CO3, or K2CO3. These alkali metal carbonates are soluble in water. • Dissolve an aliquot of your sample in water • Add in CaCl2 (aq) and mix well • Filter to isolate the CaCO3 precipitate • Dry and weigh precipitate, calculate moles CaCO3 made • Determine identity alkali metal carbonate by calculating g/mole of original unknown CHE116 Fall 2012

  5. FilteringFigure 8.1 in your lab manual details the technique of filtering R.F. Schneider Wordpress OhioStateChemistry CHE116 Fall 2012

  6. Drying Oven • Dry your filter paper and sample in the drying oven • Make sure you know which sample is yours. Pencil does not wash off CHE116 Fall 2012

  7. Additional Comments Data Table, line b, Mass of filter paper Weigh the empty filter paper after you have torn off the corner and marked it with pencil. Unknown number Make sure you record the number of your unknown CHE116 Fall 2012

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