Exp038

Dominican University student project ONS Solubility Challenge 01/28/09 Ashley Gans Solute: Tartaric Acid SMILES: [C@2H]([OH])([C@2H]([OH])[C](=[O])[O-])[C](=[O])[OH] Type: Carboxylic Acid www.**chemspider**.com/Search.aspx?q=C(C(C(%3DO)O)O)(C(%3DO)O)O - 119k Solvent: Acetone SMILES: COC1=C(C=C(C=C1)C=O)OC Solvent Density: 0.79 g/ cm^3 Procedure: A saturated solution was made in a 125 ml Erlenmeyer flask by placing about 50ml of solvent into the flask and adding additional solute while hand swirling until no more solute dissolved. Start time: 2:00 A sonicator was used to make sure that all the solution was saturated when no more solute appeared to go into solution by hand swirling. 2:47 Four centrifuged tubes were filled with approximately 6 ml of saturated solution. Each tube was centrifuged for about 3 minutes. The masses of four empty and clean test tubes were taken by taring an unused Erlenmeyer flask and setting the tube inside. Masses were recorded. 2:55 A precise volume of saturated solution was transferred into the test tubes. Volumes were recorded. 3:01 The masses of the four test tubes containing the saturated solution were measured using the same Erlenmeyer flask. Masses were recorded. 3:10 A hot water bath was used to boil off all solvent in each test tube. 3:15 The masses of all four test tubes containing the solute were measured. Masses were recorded. 3:54 The masses of test tubes were reweighed after a few days to account for prolonged evaporation. No change or the masses were recorded. Data
 * Volume of Saturated Solution |||||| 3 mL ||
 * Experiment || 1 || 2 || 3 || 4 ||
 * Mass of empty test tube (g) || 13.840 || 18.404 || 18.387 || 19.358 ||
 * Mass of test tube and solution (g) || 16.318 || 20.867 || 20.818 || 22.335 ||
 * Mass of test tube and Solute (g) || 14.094 || 18.469 || 18.600 || 19.906 ||

Results AVERAGE SOLUBILTY g/100g: 11.4838 AVERAGE CONCENTRATION mol/L : 0.7861
 * Experiment || 1 || 2 || 3 || 4 ||
 * Solubility g/mL || 0.0846 || 0.02167 || 0.0777 || 0.1827 ||
 * Concentration M (mol/L) || 0.564 || 0.1444 || 0.5175 || 1.217 ||
 * Molality mole/kg || 0.7609 || 0.1806 || 0.6999 || 1.503 ||
 * Solubility (g/100g) || 10.250 || 2.620 || 10.505 || 22.56 ||