I weighed the filter to find out the mass. I then folded the filter and placed the filter into the funnel and held the funnel over a paper cup while I poured the liquid into the funnel leaving the benzoic acid to adhere to the filter. I then allowed the filter to dry. Once dried I weighed the mass of the filter and benzoic acid and calculated the mass and recorded into table 1. I then allowed the remaining liquid to evaporate leaving behind salt.
The suction beaker was weighed then filled with water and reweighed. The first stopper was then placed on the top of the suction flask and the tube was placed in the filled beaker, while the other stopper was attached to the side of the suction flask and the tube to the aspirator. A clamp was placed on the tube attached to the aspirator. Suction was then applied by turning the aspirator on slowly which allowed the water to create suction and pulled the water from the beaker into the suction flask. Once all the water from the beaker was gone the clamp was carefully replaced so there were no air bubbles in the tube.
A trough is filled with water and then the end of the tubing not attached to the lighter is place in the cylinder. The cylinder is then laid down into the trough and tilted as to fill the cylinder all the way up with water, keeping all air bubbles out. Making sure that the rubber tubing is under the cylinder, the cylinder is inverted in the trough, still making sure there are no air bubbles in the cylinder. Also making sure that the tubing is not being pinched off by the cylinder so the butane can get into the cylinder. The release button on the lighter is pressed and held until approximately 90 ml of water is displaced from the cylinder; the level of the water in the cylinder should be level with the water in the trough.
Record the initial temperature of the liquid in the calorimeter. Watch the thermometer until maximum temperature is achieved. Weigh out 2.0g of NaOH pellets. Record the temperature of the distilled water in the calorimeter until the temperature is constant then add all of the pellets at once. Gently stir the pellets until the acid is dissolved by shaking the the apparatus.
Prepare a blank by filling an empty cuvette ¾ full with distilled water. b. Place the blank in the colorimeter cuvette holder. Align the cuvette so that the clear sides are facing the light source of the calorimeter. c. Open the Experiment menu and select Calibrate – colorimeter.
Place it on the balance and measure its mass to the nearest 0.01 g. record the mass in Data Table 1. 4. Completely transfer the water in the micropipette into a dry graduated cylinder. Measure and record the volume of the water to the nearest 0.1 mL. (Note: if the graduated cylinder is made of glass, your eye must be at the same level as the bottom of the meniscus to measure the volume accurately.
Then, by means of a dropper bottle and stirring rod, hydrochloric acid was added until all of the unknown carbonate appeared to have reacted. On a ring stand with a bunsen burner the HCl was evaporated, leaving only the NaCl. After cooling, the mass of the dish was taken once more. The mass of the left over NaCl was compared to the predicted yields to determine what the original carbonate was exactly. There was a high possibility for error in this experiment because the NaCl could not be heated a second time to make sure all of the HCl was evaporated.
Mariah Munson Lab, Week #1 BALANCE LAB Introduction <Include purpose of lab experiment> The purpose of the Balance Lab is to learn how the ILab works and also how to correctly determine the mas of a chemical. <Brief summary of topic investigating> We will lean how to read the mass off the balance, and how to find a weight of an item that is measured in a container, and how to use the centigram balance. <State major finding> I learned what the centigram balance is, it has two decimal place precision. Procedure <Include information that the reader would need to repeat your experimental procedure. Do not include any observations or results in this section?
Hydrochloric acid was then added to the solution until the bubbles stopped in order to completely get rid of all of the zinc. Next, we used vacuum filtration to filter the copper out of the solution. We drizzled alcohol and acetone over the copper to help it dry faster. Once it appeared dry, we weighed the copper and filter paper. When we subtracted the mass of the filter paper, the mass came out to 1.312g.
Swab the rubber top with alcohol and allow to dry. 6. Seat the needle. Remove the cap from the needle or blunt cannula by pulling it straight off. Draw back an amount of air into the syringe that is equal to the specific dose of medication to be withdrawn.