Lab Report Oxalic Acid

Introduction: The oxalic acid is an organic compound with the formula C₂H₂O₄. It is a colorless crystalline solid that forms a colorless solution in water. The condensed formula is HOOCCOOH, reflecting its classification as the simplest dicarboxylic acid.

Reaction:

Procedure: In a 500 ml flat bottom flask , take 15g of cane sugar( sucrose) and keep the flask in a fume cupboard. Add 75 Ml Conc.HNO3 and heat the flask on a boiling water bath. On heating the flask sugar dissolves in nitric acid and copious evolution of nitrous fumes comes out. Discontinue heating. The reaction subsides in about 20 minutes. Pour the hot solution into a porcelain dish, wash the flask with 15 mL of nitric acid and evaporate the acid solution on a water bath

0.825 g Na2WO4H2O (2.5 mmol), desired amounts of acidic ligand and 44.5 mL 30% hydrogen peroxide (440 mmol) placed in an 100 mL flask, stirred for 10–15 min to get a clear solution at room temperature. Then 10.5 mL cyclohexanone (100 mmol) added into it without stopping stirring. Continue stirring the reaction mixture at a reflux temperature for 8 h. After completion of the reaction, the reaction mixture cooled in the refrigerator for 12 h. Then white crystalline product obtained after filtration, washed with an ice water and dried in the air. The product weighted and the isolated yield of the adipic acid calculated which is based on the cyclohexanone that was put in the reaction flask.

Mechanism:

Experiment No. 19

Preparation of 2,4,5-triphenyl imidizole from Benzil

Introduction: 2,4,5-triphenyl imidazole prepared from Benzil on reaction with aldehyde and ammonium acetate in the presence of 10 mol % of ceric ammonium nitrate as a catalyst.

Reaction:

Procedure:

1. Amixture of cerric ammonium nitrate (10 mole %), ammonium acetate(40 mmole) ,and benzyl or benzoin (10 mmole) dissolved in ethanol water (20 ml 1;1 ) and to the reaction mixture , aromatic aldehyde (12 mmole) added.

2. Then reaction mixture heated at 65 C till the completion of reaction.The reaction mixture cooled at room temperature and poured on ice cold water (50 ml) to get the precipitated solid.

3. The solid collected by filteration and washed with