*Then add two drops of phenolphthalein indicator to the beaker by right clicking, choosing indications, and adding 2 drops of phenolphthalein. * Next is obtaining a 50 mL buret and to fill it 50 mL of 0.1 M NaOH solution. Do this by right-clicking on the working area, select a 50 mL buret, right-click on the buret, and choose Chemicals. * The last step is to Titrat Unknown Acid A with NaOH until the end point. Once again, right click on the working area, right click the beaker,
The mass was recorded and transferred to a 50 ml beaker. 4 ml of 6 M HNO3 was added to the beaker containing the copper. For step 2, 10 ml of distilled water was added to the beaker. Then, 6 M NaOH was added to the solution (drop wise), until placing a drop of the solution on red litmus paper turned it blue. For step 3, the solution was heated with a hot plate.
Using a measuring cylinder, add 50cm3 of 1.0mol dm-3 sulphuric(VI) acid to the thyme extract in the conical flask. 8. Titrate the solution in the conical flask with the potassium manganate(VII) solution until a pale pink colour persists for 10 seconds. 9. Repeat the titration until there are two titres within 0.1cm3 of each other.
Once the buffer tablet has dissolved into the water, add 10 ml of starch solution. 3. After the starch solution has been added, add 10 ml of enzyme solution to the current solution, simultaneously start the timer and record at 1 minute intervals. 4. In addition, place iodine in the dropping tile in order to identify if starch is currently present.
ISOLATION OF EUGENOL FROM CLOVES BY DESTILLATION + PUPOSE To perform distillation using a distillation apparatus and isolate eugenol from cloves. + EXPERIMENTAL The apparatus shown in figure was assembled using a 50-mL round bottom flask as the distillation pot. The distillation pot was charged with 2 g of ground cloves and 25 mL of distilled water. The cloves were allowed to soak in the water until thoroughly wetted (about 10 min), then the mixture was distilled, the distillate being collected at the rate of about one drop every 2 – 3 seconds. After about 10 mL of distillate were collected, the distillate was extracted with 5.0 mL of CH2Cl2 (aka DCM), then again with 5,0 mL of DCM.
The extraction process is when a solvent, dichloromethane (15mL) is added to the filtrate in a separatory funnel; the mixture is gently swirled together 3 times, and stopcock is released in between to vent the funnel. Dichloromethane (including the emulsion) is then drained from the bottom into a 50mL Erlenmeyer flask. Same extraction process is repeated on the same filtrate and the dichloromethane is, once again, let out to the same 50mL Erlenmeyer flask as before. The combined dichloromethane solution and water (20mL) is poured into a rinsed separatory funnel. Mixture is gently swirled and drained out into an Erlenmeyer flask.
Vapor Pressure and Enthalpy of Vaporization of Water I. List of Reagents: a. Water H2O II. Summary of Procedure: b. Fill a 10 mL graduated cylinder with ≈ 7mL if water c. Fill a 1000 mL beaker with ≈ 750 mL of water d. Invert the graduated cylinder into the beaker.
10 mL of distilled water were added to the beaker along with 110 drops of 6 M NaOH. The beaker was then heated for 14 minutes at 215° C. The liquid was decanted and then 10 mL of distilled water as well as 4.6 mL of H2SO4 were added as the reaction cooled. 5 mL of distilled water as well 0.4999 g of zinc were added to the beaker. The solution was left on a magnetic stir plate with a stir bar for about 20 minutes and then decanted. 5 mL of 6 M HCl were then added to the beaker.
This solution was added drop wise to the stirred ethanolic solution of benzophenone at room temperature. After all the sodium borohydride being added, the mixture was stirred for a further 10min. Meanwhile, ice water (10ml) was mixed with concentrated hydrochloric acid (1ml) in 50ml beaker. To this the mixture of sodium borohydride and benzophenone was poured slowly into the beaker. The precipitate was collected using suction filtration and washed with 2 x 5ml portions of water.
Then by writing a balanced chemical equation and using the titration formula, Nb+Ma+Va=Na+MbVb , the molarity is able to be determined. Procedure: 1) Using the graduated cylinder add 10.0 mL of water into the Erlenmeyer flask. 2) Add 5.0 mL of HCl into the flask using another graduated cylinder because acid goes into water when mixing them. 3) Add three drops of phenolphthalein indicator into the flask. 4) Swirl the flask in circular movements to mix the substances.