Molar Solubility Essay

2079 WordsApr 23, 20139 Pages
Mateo Castro April 3, 2013 Lab Partner: Unur Abdul Kader T.A: Katie Experiment 22: Molar Solubility, Common-Ion Effect Abstract The purpose of this experiment was to determine the molar solubility, the solubility constant, and the effect of a common ion on the molar solubility of calcium hydroxide. To accomplish this the experiment was split into two parts; part A and Part B. in Part A of the experiment a standardized 0.05 M solution of HCl was titrated into a 25 mL solution of saturated Ca(OH)2 which contained 2 drops of orange methyl identifier. Once the titration began, the HCl was added until the methyl orange endpoint was reached, and as a result the volume of the HCl needed for the endpoint to be reached could be used in…show more content…
Volume of saturated Ca(OH)2 solution (mL) | 25 | 25 | Concentration of standardized HCl solution (mol/L) | 0.05 | Buret reading, initial (mL) | 0 | 0 | Buret reading, final (mL) | 25.8 | 25 | Volume of HCl added (mL) | =B4-B3 | =C4-C3 | Moles of HCl Added (mol) | =B2*(B5/1000) | =B2*(C5/1000) | Moles of OH- in saturated solution (mol) | =B6 | =C6 | [OH-], equilibrium (mol/L) | =B7/0.025 | =C7/0.025 | [Ca2+], equilibrium (mol/L) | =B8/2 | =C8/2 | Molar solubility of Ca(OH)2 (mol/L) | =B9 | =C9 | Average molar solubility of Ca(OH)2 (mol/L) | =AVERAGE(B10,C10) | Ksp of Ca(OH)2 | =B9*(B8*B8) | =C9*(C8*C8) | Average Ksp | =AVERAGE(B12,C12) | Standard Deviation of Ksp | =STDEV(B12,C12) | Relative standard deviation of Ksp | =STDEVP(B12,C12) | Table 4: Molar Solubility of Calcium Hydroxide in the Presence of a Common Ion. Volume of saturated Ca(OH)2 with added CaCl2 solution (mL) | 25 | 25 | Concentration of standardized HCl solution (mol/L) | 0.05 | Buret
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