4a - solvents such as ethanol Thus adding ethanol in Step 5...

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Dr. S. Berniolles, Page 1 of 2 CHEM 6BL PRELAB/POSTLAB ANSWER KEY EXPERIMENT #4A: SYNTHESIS OF AN IRON (III) OXALATE COMPLEX PRELAB QUESTIONS (5 points) and POSTLAB QUESTIONS (5 points) PRELAB ANSWER KEY: 1. (0.5 point) The balanced equation is: 1 Fe(NH 4 ) 2 (SO 4 ) 2 ·6H 2 O + 1 H 2 C 2 O 4 1 FeC 2 O 4 + 2 NH 4 + + 2 SO 4 2- + 2 H + + 6 H 2 O On both sides of this reaction, iron is in the Fe 2+ oxidation state, so this is not a redox reaction. 2. (0.5 point) 0.00293 mol 3. (0 point) 0.0060 mol (or 6.0 mmol) oxalic acid 4. (1 point) Fe(NH 4 ) 2 (SO 4 ) 2 ·6H 2 O is the limiting reagent . This is also the limiting reagent for the overall reaction in Experiment #4A. 5. (1 point) 0.422 g FeC 2 O 4 (s) product 6. (1 point) In order to crystallize (or recrystallize) a product, the solvent system in which the product is dissolved needs to become much "poorer". In other words, a solvent in which the product has a poor solubility needs to be added to the solution. Crystallization of the product in solid form will result. Potassium (K + ) salts are much more soluble in polar solvents, such as water, than in less polar
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Unformatted text preview: solvents, such as ethanol. Thus, adding ethanol in Step 5 will result in the crystallization of the desired K-iron/oxalate complex salt product. 7. (0 point) The overall balanced equation is: 2 Fe 2+ + H 2 O 2 + 2 H + → 2 Fe 3+ + 2 H 2 O (acid) or: 2 Fe 2+ + H 2 O 2 + 2 H 3 O + → 2 Fe 3+ + 4 H 2 O (acid) 2 Fe 2+ + H 2 O 2 → 2 Fe 3+ + 2 OH – (base) 8. (0 point) See MSDS Information 9. (1 point) C 2 O 4 2– = oxalato NH 3 = ammine SO 4 2– = sulfato CO = carbonyl CO 3 2– = carbonato H 2 O = aquo or aqua NO 2 – = nitrito OH – = hydroxo Dr. S. Berniolles, Page 2 of 2 POSTLAB ANSWER KEY: 1. (0.5 point) Potassium bisoxalatoferrate(III) hydrate 2. (1.5 points) Both NH 3 and en are ligands of the Co metal Coordination number for the Co metal is 6 Co 3+ Diamminebis(ethylenediamine)cobalt(III) chloride 3. (1 point) 5.36 g of NaHCO 3 4. (2 points) 57.3%...
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4a - solvents such as ethanol Thus adding ethanol in Step 5...

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