Base Extraction Experiment: Procedure & Results for Separating Benzoic Acid & Naphthalene, Lecture notes of Chemical Experimentation

Download Base Extraction Experiment: Procedure & Results for Separating Benzoic Acid & Naphthalene and more Lecture notes Chemical Experimentation in PDF only on Docsity! Flow Chart of Procedures for Experiment #1: Two Base Extraction create again Benzoic Acid Neutralization with Acid (HCL,#7) to (Aqueous phase) Benzoic acid combined with with bicarbonate (H2CO3, #6) to form Benzoate (#5) Pure Naphthalene Removal of solvent through evaporation (Organic Phase) Naphthalene Neutralization with acid to create again 2-Naphthol (Aqueous Phase) 2-Naphthoxide Combine with sodium hydroxide (#8) to form Naphthoxide (#4) (Organic phase) Naphthalene 2-naphthol Benzoic acid (#1) naphthalene (#2) 2-naphthol (#3) Experiment: 1 Natalie Storaska 6/1/06 TA: Mike + Carolyn Two Base Extraction Introduction: Given a 2 gram sample of a mixture containing benzoic acid, 2-naphthol, and naphthalene, we are to separate each part. Procedure: 1. The mixture is dissolved in 30 ml of diethyl ether. 2. 20 ml of 10% Bicarbonate is added to the solution in a separatory funnel where the aqueous layer is then removed from the organic layer. 3. 20 ml of cold 10% hydroxide solution is then added to this organic layer into the separatory funnel. 4. The new organic layer (ether) is placed into a flask containing.7 grams of Sodium Sulfate. 5. Both bases are acidified, dried and placed aside for weighing later. 6. Solvent is then removed from the ether through evaporation to be weighed later. 7. Lastly, our mass is calculated to see if we retrieved the same out we began with. Our mass for each compound is recorded to be compared with our unknown. 8. Melting points re taken ensure purity of the three separated substances. **Please see attached flow chart.and table of reagents** Results/Observations: Observations were taken and recorded during the lab procedure. These primary observations were handed in at the conclusion of the lab period. The gathered results are depicted in the following chart. Compound Mass Melting Point Benzoic Acid .08 g** 120-125 2-Naphthol 0.51 g 118-124 Naphthalene 1.12 g 81-83.5 ** As noted in the primary lab observations, I spilled some of my aqueous solution after extracting with Sodium Bicarbonate, this is why my result (mass) for Benzoic Acid is extremely negligible. Calculations are shown on the following chart. Unknown #121 1.84 g