The amount of oxalic acid in a sample of rhubarb was determined by reacting with Fe3+ as outlined in reaction 2.2. In a typical analysis, the oxalic acid in 10.62 g of rhubarb was extracted with a suitable solvent. The complete oxidation of the oxalic acid to CO2 required 36.44 mL of 0.0130 M Fe3+. What is the weight percent of oxalic acid in the sample of rhubarb? 2Fe3+(aq) + H2C2O4(aq) + 2H2O(l) 2Fe2+(aq) + 2CO2(g) + 2H30+(aq) 2.2