Fill the burette with 0.005mol dm-3 potassium manganate(VII) solution. 6. Pour some of the thyme extract solution into a 250cm3 plastic beaker. 7. Using a measuring cylinder, add 50cm3 of 1.0mol dm-3 sulphuric(VI) acid to the thyme extract in the conical flask.
The second experiment, procedure 1, combined [Co(NH3)5 (H2O)]Cl2 (0.0060M, 1.52g) and (25mL) of distilled water to an 125mL Erlenmeyer flask. The flask was gently heated (dial 5-6) and stirred until all the compound was dissolved. The heated solution was then vacuum filtered through a fritted funnel and the filtrate was cooled in an ice bath until the
In another flask 50-mL of ice water was deposited with three-drop phenolphthalein. Using a volumetric pipet 50-mL of the 1-bromopropane was added into the empty flask in the bath. By the same method 50-mL of potassium hydroxide was delivered to the same flask while swirling the contents and remaining in the water bath. A 10-mL aliquot was immediately removed from the mixture and added to the ice water containing the phenolphthalein. When the pipet was half emptied into the ice water a timer was started.
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.
5) Swirled the solution until the NaEDTA (s) dissolved entirely. 6) After dissolving the solid, deionized water was added to the volumetric flask to make 250mL of EDTA solution. 7) This solution (from Step 6) was then transferred to a clean 250 mL Erlenmeyer flask and placed inside the desk for safe keeping; using a cork wrapped tightly in Parafilm. The disassociation of NaEDTA in water is expressed by the following equation: Na2H2EDTA (s) + H2O (l) yields EDTA4- (aq) + 2Na+(aq) + 2H+(aq) Na2H2EDTA (s) has a molar mass of 372.24 g/mol. Procedure - Reacting EDTA with your Zinc ion in Zinc Iodine Purpose; The
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.
Microcalorimetry experiment was performed on Setaram−C80 heat flow calorimeter coupled to a multiport high-vacuum homemade glass manifold. A specific amount of the sample (approx. 500 mg) was taken into a sample cell, reference cell was taken as empty and together they are connected with Pyrex tee. The sample was heated from room temperature to 200°C under vacuum and kept for 2 h, then 3-4 doses of helium gas were introduced into the system to remove any excess residue such as moisture or organic impurity from the system. The system was heated for 4-5 hr under vacuum at 200°C and then cooled down to the temperature (50°C) where we want to perform the adsorption study.
The pipette was then filled with 25.0mL’s of acetic acid and then drained into a conical flask, to speed up the process both of the conical flasks were filled with 25.0mL of the acetic acid. 8. Three drops of phenolphthalein was then added to the flask with the acetic acid. 9. The conical flask was then positioned to just under the burettes dropper which had its stopcock opened to allow a medium drip rate and had the sheet of filter paper slipped under it so that the colour could be seen more earily.
Prepare the apparatus according to diagram A. 2. Prepare 100 cm3 of 0.2 M hydrochloric acid by mixing 10 cm3 of 2 M hydrochloric acid with 90 cm3 of distilled water. 3. Fill the conical flask with 50 cm3 of 0.2 M hydrochloric acid.
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.