After the mixture was heated, there was solid on the bottom and liquid on the top of the flask. The set up was let cool to room temperature. Next, we decanted the mixture in to a clean 100 ml beaker. We rinsed the remaining solid with 10 ml of DCM and swirled the mixture. The mixture was decanted again in to the same beaker.
Specific Heat of a Metal Michael Diaz Ms. Zhort Performed: October 3, 2013 Due: October 24, 2013 Period: 1 Lab Partner: Rocco & Asha Objective: This lab was meant to teach us how to find the specific heat of a metal sample. Materials: * Specific heat set * Balance * Thermometer * Tap Water * Hot plate * Polystyrene cup and a lid * Stirring rod * 250 mL beaker * String (about 15 cm) Procedure: 1. Fill a 250 mL beaker approximately half full of water. Place the beaker of water on a hot plate. Begin heating the water to the boiling point.
Gently stir the pellets until the acid is dissolved by shaking the the apparatus. Lift the calorimeter lid and wash out its contents and the thermometer. Repeat this experiment using 50.0 mL of 1.0M acetic acid. Repeat experiment using 25.0 mL of each 2.0M sodium hydroxide and 2.0M acetic acid. Data Table(s): Reaction equation Mass of solid NaOH Initial Temp.
I then poured the mixture on to a solid white piece of paper. I then used a magnet wrapped in clear plastic bag to separate the iron from the mixture. I weighed the iron and calculated and recorded the mass in table 1. I put the remaining mixture in a beaker with 50 mL of distilled water and heated to a boil and removed, then poured the liquid from the beaker into a paper cup. I then added 15 mL of distilled water and heated to a boil and removed, then poured the liquid from the beaker into the same paper cup that held the previous liquid.
Then place the water in the 25ml beaker for the heating bath and lower the set-up so that when the 25ml round bottom flask is immersed the beaker is about 2/3 full. 5. When that is finish, using the highest setting on the hot plate heat the water until it is nearly boiling. Then turn the heating bath off. 6.
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.
With increasing temperatures the solute can be dissolved by a solvent during recrystallization. Experimental section Preparation of Chalcone To prepare chalcone 2.1mL of NaOH in was dissolved in 40mL of water and about 25mL of ethanol was added in a 125mL Erlenmeyer flask as soon as pellets were dissolved. Then 0.080 mole of acetophenone was stirred into the 125 mL flask, then place into an ice bath. At once 0.080 moles of bezaldehyde was added to the mixture and stirred all the while temperature was kept between 20-30°C. A stopper was placed on the flask while the mixture was stirring with stirrer for 11/2 hours.
Stirred the mixture to make sure all soluble material dissolves. 10. Poured the liquid while it is hot into a small paper cup. 11. Poured another 10 to 15mL of distilled water into the beaker containing the sand, brining the mixture to a boil and decanted again into the same cup used previously.
Extraction and Drying: Using a separatory funnel, the cooled filtrate was extracted with 10ml of methylene chloride. After shaking our mixture, we broke and dried our emulsion by slowing passing the lower layer through a cotton ball layered with anhydrous magnesium sulfate. The extraction process was repeated 2 more times for maximum collection of the organic layer. Distillation: The extracts were poured into a 50ml round bottle flask and connected to a simple distillation apparatus. To obtain the caffeine, the methylene chloride was removed from the extract, leaving us with our solid caffeine residue.
• Next, I added 25mL of absolute ether and attached a reflux condenser to the flask. I turned on the water when I saw ether vapor had successfully wet the joint at the top of the condenser. • Every 60 seconds, I swirled the flask and I continued to perform this action until I saw that the reaction