Once the cola starts to boil, continue to boil it for another 10 minutes so that the carbon dioxide is removed. When the cola has finished boiling, cool it in an ice bath and pour the cola back in the volumetric flask and use distilled water to fill the flask to compensate for the evaporated water. Using a volumetric pipette, transfer 60ml of the cola to a beaker and put the magnetic stirrer in the beaker. Submerge the conductivity probe in the cola. Fill up the burette with NaOH
10 ml NaOH was again added and mixed for 15 seconds to make lump free slurry. The mixture was stirred and allowed to stand for 3 minutes. An additional 10 ml of caustic soda was poured in the beaker and stirred for 10 minutes to mix thoroughly. In between the stirring, remaining 30 ml of 17.5% caustic soda was added at 2.5, 5 and 7.5 minutes in installments of 10 ml each. This mixture was allowed to remain in the beaker for 30 minutes further, making the total treatment time of 45 minutes from the beginning.
Shake funnel and rinse off water layer ( This contains the sulfuric acid and majority of methanol). Again wash the ether with 25ml of water and then wash the organic layer with 25ml of 10% sodium bicarbonate to extract unreacted benzoic acid. Again shake separatory funnel with frequent venting of pressure and opening the stopcock. Allow the separation of layers and drain off bicarbonate layer into a beaker. Wash ether layer with saturated sodium chloride solution and retain ether layer.
Halogenated solvents are denser than aqueous solvents and thus halogenated solvents sink to the bottom. Therefore, the water drop test should be conducted to be sure which layer is aqueous. Additionally, to transfer a compound from the organic layer to the aqueous layer the compound can be converted to an ionic form as ionic compounds are polar, it will not dissolve in the organic layer and will pass through it to the aqueous layer from which it can be extracted while the other organic compound remains in the organic layer. To convert it to an ionic compound the compound needs to be reacted with either aqueous acid or
36) The left and right beaker are emptied and clean to begin the next trial. 37) The 200 (MWCO) Dialysis Membrane was placed between the left and the right beaker. 38) Nine millimolar of Na⁺Cl⁻ is placed inside to fill the left beaker. 39) Deionized Water is placed inside to fill the right beaker. 40) A sixty-minute timer was started to see how the 9 Na⁺Cl⁻ (mM) solvent diffuses through the 200 (MWCO) Dialysis Membrane.
40ml of calcium iodate in water was obtained and placed in a clean labeled beaker. The buret was rinsed and filled with sodium thiosulfate, followed by recording its initial volume. Consequently, 200ml of 0.240M of KI was obtained and poured into a 400 mL beaker. In addition, a clean, dry 250mL Erlenmeyer flask was obtained and 50ml of KI was added into it using a 50mL graduated cylinder. Besides, 10mL of Ca(IO3)2 solution was added to KI solution in a 250mL Erlenmeyer flask using 10.00mL graduated pipette.
Repeat step 17 to 20 for 5 times. In beaker put 5ml of 2mole Hydrochloric acid, which is measured by beaker. In beaker from step 21, put 15ml of distilled water, which is measured by cylinder. With the glass rod stir beaker in step 22. Repeat stet 4 to 9.
I. INTRODUCTION This report discusses an experiment, the objective of which was to determine the classification of six known chemicals: sodium nitrate, barium chloride, silicon carbide, naphthalene, urea, and antimony and two unknown chemicals XIa and XIb. Since each type of chemical (ionic, molecular, macromolecular and metallic) has its own set of properties, by testing these properties and finding them out for each chemical, it was possible to classify them. The properties tested during this experiment were solubility in water, toluene, and ethanol and the electrical resistance for those soluble in water. The melting point was tested for the two unknown chemicals.