Synthesis and Titration of Oxalate CompoundsBy Ravi JindalPartners: Abhi Malhotra, Mike Davidson, Rebecca CohenLab Conducted: October 16 2013 and October 30 2013Lab Due: November 6, 2013Section: B03TA: RyanHonor Pledge: I did not copy this work from other students or old lab reports.X___________________________________________________
DATA AND RESULTS Week 1 – Synthesis of a Metal Oxalate CompoundTable 1 – Data for Synthesis of a Metal Oxalate Compound: Cobalt ChlorideHexahydrate (CoCl26H2O)Oxalic Acid Dihydrate(H2C2O42H2O)Molar Mass (g/mol)237.93126.07Number of Moles Used(mol)0.009850.0100Mass Used (g)2.3441.265Mass of isolated product [Co(C2O4)(H2O)2]: 1.65 gramsObservations of Synthesis: A pinkish/brownish color was observed when the two reactants were mixed. The resulting crystals were a dark brown color. After they were allowed to dry for two weeks,they became a significantly lighter shade of brown. Week 2 – Redox Titration of a Metal Oxalate CompoundTable 2 – Data for Standardization of Titrant: Mass Sodium Oxalate (g)Volume Titrant (mL)0.10130.500.10130.450.10130.47Table 3 – Data for Titration of Metal Oxalate Compound:Mass Co(C2O4)(H2O)2(g)Volume KMnO4(mL)0.10722.300.10924.00
DiscussionThe purpose during the first part of the experiment was to synthesize a metal oxalate compound, Co(C2O4)(H2O)2, from oxalic acid dehydrate and cobalt chloride hexahydrate. In order to synthesize the compound, we used0.00985molesof Co Cl2⋅6H2Oand 0.010034moles of H2C2O4⋅2H2O. Because of the 1 to 1 ratio between the two reactants, the cobalt chloride hexahydrate was the limiting reactant. The reactants were also in a 1 to 1 ratio with the product, so 0.00985 moles of Co(C2O4)(H2O)2were expected to be made. This means that the theoretical yield was 1.80 grams of Co(C2O4)(H2O)2. In actuality, we obtained 1.65 grams of the product. This means the percent yield was 91.7%.