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.
Once it is completely distilled, remove your filtered material and add 2 mL of dichloromethane. Swish the flask, and then place into a small beaker. Next, place the beaker with the distilled liquid on a heating mantle and heat to a gel like substance. Make sure not to burn it. The next processes that will be
Take the fine soil from the bottom pan of the sieve set, place it into a beaker and add 125mL of the dispersing agent. Stir the mixture until the soil is thoroughly wet. Let the soil soak for at least ten minutes. 2. While the soil is soaking, add dispersing agent into the control cylinder (Sodium Hexametaphosphate 125ml) and fill it with water to the mark.
Pour all the filtrate and washings into a 250cm3 volumetric flask. Make up to 250cm3 with 1.0mol dm-3 sulphuric acid(VI) acid. Stopper the flask and invert several times to thoroughly mix the solution. 5. Fill the burette with 0.005mol dm-3 potassium manganate(VII) solution.
Add 10 ml of ph 10 buffer to the same Erienmeyer flask. Start swirling immediately to dissolve, 7. Add 15 ml of water next. Use a squeeze bottle so you can wash the inside walls of the flask. 8.
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
Then do the same thing with a separate unknown weight and Beaker and Centigram Balance. Next, measure all of the same measurements with the Electronic Balance and record the information. Record all of the information in the table below. For more information make the exact same measurements in order following the data table below. Data: The Centigram Balance: Direct Weighing Mass of slug on a centigram balance using the direct-weighing technique: ___2.99g___ * Mass of the same slug directly on another centigram
Cool the beaker in ice water for 10 min, with stirring, and collect the solid by vacuum filtration on a small Hirsch funnel. Rinse with three small portions of water, by breaking the vacuum, adding just enough water to cover the solid, and reapplying the vacuum as before. Filtration of the fine crystals is slow. Using too much rinse water will slow the process considerably. Allow the solid to dry at least overnight, weigh it, take a MP, and calculate the % yield.
Tap the magnet gently on the side of the beaker to dislodge the wood shavings. 15. Complete the Magnetic column in the data sheet. 16. Put a few iron filings back into the 100 mL beaker.
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.