Added 2-3mL of liquid household bleach solution and stirred; solution turned orange. 5. Dipped cotton swab into the salicylic acid hydrolysis solution and wrote a message on a blank piece of flat, white paper and allowed it to dry. 6. Laid the dried message paper on several layers of paper towels for the visualization step to keep the developer solution from soaking on the work surface and surrounding materials.
You will observe in this experiment some of the characteristics of the alkaline earth metals discussed here and will write balanced equations for all reactions. Purpose: Investigate some reactions of some group 2 elements and gain some insights into the properties of these alkaline earth metals. Equipment: (pg 131) Materials: (p 132) Safety: • Avoid skill and contact with your skin • Tie back long hair • Wear safety goggles Procedure: (record all data in the observations and data section) Part A 1. Pour 5 ml of distilled water into a clean and dry test tube and put the test tube into on the test tube rack. Add a calcium turning to the water in the tube.
Make sure that none of the tubes have been contaminated with acetone (which gives a positive DNP test) in the cleaning process. 3. Put 10 drops of DNP reagent into each of the four test tubes. **Safety alert**The DNP reagent should be handled carefully and kept off skin and clothing. If contact occurs, wash the contacted area immediately with cool water.
In each well plate place a small amount of known substances into the well plate. Use a different well plate for each substance. A beaker with 10mL of 6.0 M HCL solution was obtained along with a wire loop. Once this was done the flame burner was turned on to low. It was made sure that the nichrome wire was cleaned to not contaminate the other substances.
In an actual lab the wet loop will help in picking up the salt * Add a small quantity of the salt, 1 gram using the “All Chemical” menu option. * Hold the salt in the flame and burn to show color (record the color). * * Do the same for all salts, being sure to use a different metal wire for each. Also be careful not to drop any salt onto the Bunsen burner. Clean-up: Be sure
Mix pairs of solutions in the following ways, and record all of your observations in the data table. System 5: FeCL3 + KSCN System 6: Fe CL3 + AgNO3 System 7: FeCL3 + K4Fe(CN)6 Part B: Reactions of Acids To four of your calibrated test tubes, add 3-ml of hydrochloric acid, and to four different test tubes add 3-ml of HNO3.…Test the reaction of the acids to litmus paper by dipping a glass rod into the test tube containing the acid you are testing and touching it gently to both the blue and red litmus paper. Record observations in the data table. Make sure you rinse off the
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.
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.
We measured out 100 mL of water and transfered it to a styrofoam cup from our graduated cylender. Using the Vernier temperature probe connected to our laptop, we observed the temperature of the metal sample in the boiling water. We transferred the metal sample to the syrofoam cup and observed the temperature of the water with the hot metal sample in it. ::|Mass|Initial Temperature|Final Temperature (Water and Metal)| Water|100.0g|23.0ºC|27.0ºC| Metal|82.6g|89.0ºC|| We used the specific heat formula to find the specific heat of our sample. The formula is: Q=cpmΔT we used a simple formula to find the heat energy that was gained by the water.
Each organic extract is then dried over anhydrous calcium chloride pellets and evaporated to dryness. The extract is then wet with a minimal amount of dichloromethane and a sample of each is obtained and mixed together with 200 mg of alumina and again evaporated to dryness. This mixture is then placed in the prepared chromatography column and eluted with hexanes until the yellow β-carotene band is collected. The solvent is then switched to a 90/10 mix of hexanes and acetone to speed up the elution of the more polar lycopene band, which is also collected in its own flask. Each of these samples is evaporated to dryness and rehydrated with a minimal amount of dichloromethane.