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.
Lab 2: Preparation of Triphenylmethanol by a Grignard Reaction Introduction: The Grignard addition of an organomagnesium compound to a carbonyl to form an alcohol is one of the classic reactions in organic chemistry. First, magnesium will be inserted into a carbon-halide bond to form nucleophilic phenylmagnesium halide Grignard reagent. This reaction is an oxidation of the metal converting Mg0 to Mg2+ carried out in anhydrous ether solvent. This process will be done with care due to the moisture sensitivity of the phenylmagnesium halide. Second, methyl benzoate is added to form a new carbon-carbon sigma bond.
Determining the Chemical Formula of a Hydrate Purpose: Find the molecular formula of the hydrate of Copper (II) Sulfate. Materials: * 400 mL beaker * Tongs * Scoopula * Electronic Balance * Glass Rod * Hot Pad * 3 g hydrated copper(II) sulphate * Eye Protection Hypothesis: This lab will demonstrate a dehydration reaction. When the beaker containing hydrated copper (II) sulphate is heated, the water will evaporate, causing the color to change from blue to white, and the mass to decrease. Procedure: 1. Measure & record mass of beaker 2.
Experiment 4: Recrystallization of Pure Phthalic Acid, Benzoic Acid, and Naphthalene Experiment 4: Recrystallization of Pure Phthalic Acid, Benzoic Acid, and Naphthalene Introduction: This experiment involves the technique of recrystallization by utilizing the compounds phthalic acid, benzoic acid, and naphthalene. Recrystallization is an effective method in purifying solid organic compounds. It is useful for a majority of solid organic compounds at room temperature. Selecting the appropriate solvent in the recrystallization process is a crucial step. Organic compounds tend to be more soluble in hot solvents than in cold solvents.
Since the sodium chloride is soluble in water, gravity filtration will allow for separation of the calcium carbonate and sand (residue) from the NaCl+H2O (filtrate) solution. To separate the water from the NaCl, evaporation is utilized which leaves only the sodium chloride that was in the original mixture. When the NaCl has cooled to room temperature it can then be weighed. The residue from the gravity filtration (sand and calcium carbonate) is then added to 3M HCl to react with the calcium carbonate. Through decantation the resulting supernatant CaCl2+3M HCl solution can be separated from the sand that has settled at the bottom of the beaker.
Separation of a Solid Mixture Purpose In this experiment I will become familiar with the separation of mixtures of solids. I will also learn separation techniques based on the chemical properties of a substance. Procedure I first measured my weighing dish to find out its mass. I then poured the mixture into the weighing dish and found out the mass of the mixture. I then poured the mixture on to a solid white piece of paper.
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.
The results were Acetone which boiled at 56 degrees and Toluene which boiled at 111 degrees. Introduction/background Distillation is a very know method used to separate liquids based of their characteristics and properties. In order to separate mixtures, heat is applied to the liquids, which have different boiling points, to force them into a gas phase. After, the gas is collected and converted back into a liquid phase; doing this process over multiple times help increases the purity of the product. Or vice-versa the process can be used to convert gases into liquids by changing the pressure or temperatures.
Synthesis and Derivitazation of a Chalcone Introduction Chalcone is prepared for this experiment by aldol reaction of aldehyde and an acetophenone. Chalcone is synthesized to other reactions such as isoxazole, chalcone dibromide, and chalcone oxide. In these synthesizing experiments filtration and recrystallization takes place. The filtration is done to separate the solvent from the sample. With increasing temperatures the solute can be dissolved by a solvent during recrystallization.
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.