2. In order to eliminate any air trapped in the jet, the hydrochloric acid was allowed to run out and the burette was refilled to above the zero mark. 3. The tap of the burette was then opened to allow the acid to run out until the bottom of the meniscus was just on the zero mark when viewed at eye level. 4.
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 watch glass was removed with the beaker tongs. Using a rubber bulb and a stirring rod to stir the solution continuously, 15.00mL of .25M BaCl2 solution was added to the solution in the beaker. The watch glass is replaced and the solution is keep hot but not boiling for 15 minutes. The precipitate was allowed to settle. When the liquid above the precipitate was clear, the solution was tested for completeness of precipitation when a few drops of BaCl2 solution were added from a pipette.
Stirring carefully and observe the color of the hydrate until it changes to a consistent white color, then the Copper(II) Sulfate is dehydrated. 6. Turn off the burner, and wait to cool down the material. 7. Carefully determine the mass of the Copper(II) Sulfate, crucible, and lid.
HCl is carefully dropped into the Erlenmeyer flasks with the primed pipette until the solution turn to a green tint. Once the green tint has been achieved, drop one or two more drops of HCl to the solutions until the tint turns yellow. The flask is heated until all of the
The paper was then put into a beaker of a hydrochloric acid, ethanol, and butanol mixture, being sure that the paper does not touch the sides of the beaker, and then topped. After the eluting solution has risen to within two centimeters of the top of the filter paper, the paper was removed from the beaker, dried, and was stained with a staining reagent solution containing potassium ferrocyanide and potassium iodide. This reagent forms colored precipitates or reaction products with many cations, including all of those used in this experiment. The distance of which the spots moved were determined by calculating the Rf value of each substance. The Rf value is determined by following formula: Rf=DL=distance component movesdistance solvent moves This experiment was successful overall, given a few errors.
5. The burette was then refilled with the NaOH and the meniscus was adjusted so that it sat at 0.0mL 6. The pipette was filled with the acetic acid and then drained once again to ensure the pipette wasn’t contaminated as otherwise the obtained results could have been incorrect. 7. 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.
Add the HCl SLOWLY to the magnesium by running it down the side of the beaker. Adding the acid too quickly will result in the spattering of the acid. Write down any observations of the reaction. 6. After all the acid has been completely added and the reaction has stopped, use a pipette to add a few extra drops of acid into the beaker until the reaction stops.
Materials and Methods In this experiment, an aluminum can was reacted in order to form potassium aluminum sulfate, or rather, alum. Aluminum cans have a thin coating of plastic on the inside that is surrounded by a thin coating of paint on the outside. In order to get just aluminum, the paint had to be removed. A 250 mL beaker was weighed and the weight was recorded. Scraps of aluminum can weighing between 0.9 to 1.2 grams was then placed inside of the beaker and the beaker with the pieces of can was weighed again in order to obtain the mass of the aluminum can pieces.
Mixture is gently swirled and drained out into an Erlenmeyer flask. Anhydrous magnesium sulfate is added to dehydrate the washed mixture. The solution is then filter into a weighed, dry, 100mL Erlenmeyer flask. Dichloromethane in the mixture is vaporized with a rotary evaporator. The Caffeine, white powder residue, (0.0486g) should be obtained.