2200LabManual(Current_New)_04_SolubilityWksht_Aug22

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54 Chemistry 2200: Experiment 4: Worksheet: Solubility of Sodium Oxalate Name: Partner: Lab section: Lab Instructor: Report Requirements: The report for this experiment should consist of the completed worksheet, including calculations, and graphs (2). Pay particular attention to reporting measurements, and results of calculations, to the correct number of significant figures, and comment on the accuracy and precision of your results in the questions. Show a sample calculation for one trial one of the standardization of potassium permanganate, and a sample calculation for unknown sample A1. Results of the other calculations may be input without showing calculations. Introduction: please use complete sentences. 1) Define the solubility product, K sp . 2) Briefly describe the methods used in this experiment to determine the solubility of sodium oxalate.

55 Experiment 4: Solubility of Sodium Oxalate: Data Standardization of Potassium Permanganate Trial 1 Trial 2 Trial 3 Mass Sodium oxalate used Moles Sodium oxalate used Moles KMnO 4 needed (from stoichiometry of reaction ) ml KMnO 4 titrated Molarity of KMnO 4 (=moles/liters) Average Molarity of KMnO 4 Sample calculation for trial 1

56 Determination of Solublity of Sodium Oxalate Sample A1 Sample A2 Temperature of Sample Volume of sample (in L) Volume KMnO 4 used (in L) Moles KMnO 4 used (Molarity x L) Moles sodium oxalate in sample (from reaction stoichiometry) Average moles sodium oxalate in A samples Average grams sodium oxalate in A samples Average molarity of sodium oxalate in A samples (mol/liter) Average solubility of sodium oxalate in A samples (g/liter) Sample calculation for A1 Sample B1 Sample B2 Temperature of Sample Volume of sample(in L) Volume KMnO 4 used (in L) Moles KMnO 4 used (Molarity x L) Moles sodium oxalate in sample (from reaction stoichiometry) Average moles sodium oxalate in B samples Average grams sodium oxalate in B samples Average molarity of sodium oxalate in B samples (mol/L) Average solubility of sodium oxalate in B samples (g/L)

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57 Determination of Solublity of Sodium Oxalate (continued) Sample C1 Sample C2 Temperature of Sample Volume of sample(in L) Volume KMnO 4 used (in L) Moles KMnO 4 used (Molarity x L) Moles sodium oxalate in sample (from reaction stoichiometry) Average moles sodium oxalate in C samples Average grams sodium oxalate in C samples Average molarity of sodium oxalate in C samples (mol/liter) Average solubility of sodium oxalate in C samples (g/liter) Sample D1 Sample D2 Temperature of Sample Volume of sample(in L) Volume KMnO 4 used (in L) Moles KMnO 4 used (Molarity x L) Moles sodium oxalate in sample (from reaction stoichiometry) Average moles sodium oxalate in D samples Average grams sodium oxalate in D samples Average molarity of sodium oxalate in D samples (mol/liter) Average solubility of sodium oxalate in D samples (g/liter) Plot solubility of Na 2 C 2 O 4 , in grams per liter, as a function of temperature, in ºC.

58 Determination of K sp : Determine the value of Ksp for the reaction at each temperature using the average molarities of sodium oxalate. Show calculations. K sp (A) = __________ K sp (B) = __________ K sp (C) = __________ K sp (D) = __________ Summary and Graph Complete the following table. Sample K sp Temperature, K lnK sp 1/T, K -1 A B C D From the Arhenius equation, ࠵?࠵?࠵? !" = − ∆࠵? ࠵? . 1 ࠵? + ∆࠵? ࠵? a plot of lnK sp vs 1/T will produce a straight line of slope ∆H/R and intercept ∆S/R. Plot this graph and attach it to this worksheet. Determine the slope of the graph (or state the equation of the line) Equation of line: Slope: Calculate ∆H from the slope of the graph. (show calculation) ∆H = ________________

59 Post Lab. Questions: 1. Using your graph of solubility vs temperature, show how your solubility data compares with the following values found in the Handbook of Chemistry and Physics: 20ºC, 37 g/L; 100ºC, 66 g/L 2. Is the dissolving process exothermic or endothermic? Explain. 3. Le Chatelier's principle states that when a change is imposed on a system at equilibrium, the system will react, if possible, in the direction that reduces the amount of change. Are the results you obtained in agreement with this principle? Explain. 4. Without performing calculations, what do you believe the sign of ∆S will be for the dissolution of sodium oxalate? Explain

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