To perform the experiment, we had to carry out this experiment in well-ventilated area because the volatile unknown liquid could have been flammable, toxic, or irritant. In addition to that, we also had to wear department safety goggles, avoided skin/clothing contact, and most importantly, tried not to inhale any of the vapor. Now to actually perform the experiment, we placed a boiling stone into a 25 mL Erlenmeyer flask. Using a small piece of aluminum foil and a rubber band we sealed the mouth of the flask. We pinched a small hole in the center of the aluminum foil, and we measured the mass of the dry flask, boiling stone, and foil cap to the nearest 0.001 g. We obtained about 25mL of an unknown volatile liquid using a 10 mL graduated cylinder. We meticulously took …show more content…
We fasten a clamp to the neck of the flask, covering the foil cap with the clamp. We prepared a hot-water bath by placing approximately 150-200 mL of tap water into a 400 mL beaker. We attached a support ring to a ring stand. We placed the beaker through the ring. Adjusted the ring to stabilize the beaker while it was sitting on a hot plate. We suspended the flask at a slight angle, up to its neck in the water bath, making certain that the water never touched the foil cap. To suspend a thermometer in the water we rolled a piece of napkin paper, and used a clamp to supported to the apparatus, making certain that the thermometer bulb didn’t touch the bottom of the beaker. We turned on the heating plate, and boiled the water in the water bath. We waited for the whole unknown liquid to vaporize, and recorded the water-bath temperature. As soon as the liquid completely vaporized, we removed the clamp-flask assembly from the water bath. We turned off the hot plate. By holding the flask and its contents under cold tap water we cooled down. After the flask cooled down, and the flask vapor condensed back into a liquid, we removed the clamp from the
Wash the clamp and aluminum cup if any food is stuck to it with soap and water, and dry it with a paper towel. Dispose of the water in the beaker, and wash the beaker.
The unknown liquid was also conductive and had a higher boiling point. Considering these results, we concluded that the unknown liquid was not pure water. In lab 3, we designed experiments to determine how many substances the unknown liquid contained. We first observed the unknown liquid
9) Trial E: Remove the syringe and empty the beaker. Add a Thermometer to the beaker. Add 200 mL of Room Temperature water to the beaker and heat with a Bunsen Burner until it reaches 100° C. Remove the Bunsen Burner. Repeat Steps 5 & 6.
17) Pour a small amount of the hot solvent into the flask containing the solid.
In the lab we filled the first beaker up with water. Then we took a pipet (filled with the liquid) and dropped water droplets onto the
hot. After the flask was clamped with a condenser into 400mL of boiling water. The condenser was to
Then we put the flask in the middle of the box on top of a ton of cotton balls and a layer of tin foil to stop conduction, then we put pieces of tin foil wrapped cardboard around the flask in the box. After that we stuffed about 200 cotton balls in the walls of the box in between the cardboard and the outside of the box to insulate the walls. Also when we put the flask in the box we taped it shut with black duct tape to stop convection because shiny stuff reflects. After we tested our trial 2 project we found out that we lost 13.7℃. ONe thing we did well on trial to was that we insulated the walls very with cotton balls. Also we stopped conduction pretty well because the flask was not touching anything ,but the tin
The vapor pressure increased, and the air pressure decreased. The air pressure decreasing was more drastic however. This was shown by the water boiling after submerged. The air in the flask was cooled, so the pressure was decreased. This caused the vapor pressure to be greater than the air
The Claisen adapter was then removed from the 250 mL round bottom flask and the condenser was then attached to the top of the round bottom flask which was then put on ice. The sulfuric acid solution was then poured through the condenser in order to protonate the product. A stirring rod was then used to dislodge any solid that was stuck to
Part A: Vapor Pressure of a Pure Liquid For experiment 2, I worked with Amiel Angelo. First, I began by calibrating the LabQuest2, while Amiel set up the glassware. Basically, I connected my email to the LabQuest2 and proceeded by plugging in the temperature probe to CH:1 and the pressure sensor into CH:2.
We found they all had tinfoil but their insulation was on the inside of the tinfoil. They also all had the flask in a box. The box must have acted as an insulator because it was trying to keep heat in. However, our group realized they had to open the box every minute to take the temperature. We knew we could make a more efficient way to take the temperature.
Place a burette on the conical flask and then hold it by using a clamp stand.
Once cooled, I placed the flask in an ice bath, which formed an orange solid.
Place the beaker on the hot plate, place the thermometer in the beaker and set the hot plate to 5oC.
When the heat was added to the flask the residue dissolved and the reactant mixture was clear.