Sodium hydroxide was again drawn up using the pipette, to above the graduation mark, where the meniscus was allowed to fall until the bottom of it was rested on the graduation mark when viewed at eye level. 6. The sodium hydroxide was then run from the pipette into a conical flask where after all the liquid had run out, the tip of the pipette was touched against the bottom of the flask and withdrawn soon after. This was then repeated with the second conical flask. 7.
17. Press START and turn on the stir bar. 18. After 10 seconds have elapsed, add hot water sample 19. Press STOP when the thermograph stabilizes 20.
Record the combined weight 4. Determine the weight of the water by subtracting the empty beaker weight (step 1) from the weight of the beaker plus 50 ml of sea water (step 3) 5. Place beaker on hot plate and evaporate most of the water. Record the time and temperature at which the seawater begins to boil. As the water is being evaporated, record the temperature every 2 minutes.
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.
All the washings were placed into the volumetric flask. 4. The pipette and 50mL beaker were washed three times with distilled water. 5. Water was added to the 250mL mark using the pipette until the base of the meniscus was on the line.
Put that magnesium strips into the conical flask which contains 50 cm3 of 0.2 M hydrochloric acid. 6. Immediately close the conical flask with stopper and start stopwatch. 7. Record the volume of gas in burette in every 30 seconds for 5 minutes.
The graduated cylinder will collect the distillate. Make sure to leave area between the end of the distillation take-off and the cylinder so that you can see the drops of distillate leave the distillation apparatus. All experiments will be done using the Celsius temperature scale. Notice that the temperature displays in the neck of the round bottom flask. Right-click on the flask, and select 50 mL of crude oil from the Chemicals Window, next
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
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.
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.