Obtain 6 clean/dry test tubes and arrange in your test tube rack. Label the test tubes 1,2,3,4,5,&6 6a. Test tube 1: Add 5 drops of Barium nitrate solution. Test 2: Add 3 drops of Sodium chromate solution. Combine test tubes 1 and 2 into one test tube (pour test tube into test tube 1).
10/8/13 Lab Report Introduction The purpose of the experiment was to do three different reaction and calculate the enthalpy change of the reaction with Hess’s Law. Then compare your calculated results to the results from the experiment. Experimental Design Materials: Vernier computer interface Computer Temperature Probe Two styrofoam cup 100 mL graduated cylinders Glass stirring rod 2.0 M Hydrochloric acid, HCl, solution 2.0 M Sodium Hydroxide, NaOH, solution 2.0 M Ammonium Chloride, NH4Cl, solution 2.0 M Ammonia, NH3, solution Ring Stand Utility Clamp Fume hood or well-ventilated room Magnetic Stirrer Paper Lid Procedures: Use proper lab safety and wear safety glasses, and make sure in well-ventilated room. Connect the temperature probe to the Vernier interface in the Channel 1 port. Then connect interface to the computer using the USB cable.
Hypothesis: Using melting points can help determine the difference in total carbon atoms and branches between two or more compounds. Materials List: 1 Spoon 1 Paper towels 3 Small rubber bands 2 Clean sheets of paper 1 Beaker, 100 mL, glass 1 Burner-fuel 1 Burner-stand 1 Goggles-Safety 1 Magnifier, dual 1 Thermometer-in-cardboard-tube 1 Capillary tubes-3/pack 1 Tetracosane Crystals - 0.2 g in Vial 1 Tetradecanol Crystals - 0.2 g in Vial Procedures: Prior to beginning the lab exercise, read the instructions carefully. Begin by setting up a derivative melting point table to collect the data accumulated during the exercise. This lab uses heated water so be sure to follow safety procedures carefully. While conducting this laboratory experiment, be sure to use minimal amounts of each substance in order to create the habit of using only the amount necessary.
We added anhydrous Sodium Sulfate as a drying agent. To complete, we distilled the cyclohexene and collected the product. Knowing this data, we determined the yield % which is 58.5%. This experiment features the dehydration of cyclohexanol and produce cyclohexene. The acid catalyzed dehydration of cyclohexanol with distillative removal of the resulting cyclohexene from the reaction mixture
The purpose of this lab is to focus on how to make zinc iodide in a different way using compounds instead of elements, which are barium iodide and zinc sulfate. We will see if the reaction between these two compounds will occur and make a prediction by writing a chemical equation. The procedures for this lab are to place a small test tube inside a 50mL beaker and weigh it. Then, using a spatula, add 0.45±0.03 g of zinc sulfate heptahydrate into the small test tube and record the mass. After that, dissolve the sample in 2 mL of deionized water and shake the test tube for 1 to 1 ½ minutes to dissolve the solid.
Determination of the Equilibrium Constant Using Spectrophotometry of Bromothymol Blue Primary Author: Chris Hernandez Introduction The Equilibrium constant is very important in many aspects of chemistry and chemists very often use spectrophotometry to find this equilibrium constant. The equilibrium constant, Ka, and the pKa of Bromothymol Blue were found using spectrophotometry. Materials and Methods The first step to find the equilibrium constant was to prepare the spectrophotometric samples. 50 mL of a sodium phosphate buffer was added to a 150 mL beaker. Approximately 20 drops of a .04% Bromothymol blue solution was then added to the beaker of the phosphate buffer.
Carboxylic acids, their derivatives and Amines Experiment 1 5 cm3 of dilute ethanoic acid with : | Turned: | A few drops of U.I solution | Pinky red | Strip of magnesium | Effervescence | ½ spatula of sodium hydrogen carbonate | effervescence | ¼ spatula of Copper (2) oxide | Turns brown/black then goes deep blue | 3cm3 of ethanol + Conc H2SO4 + sodium carbonate solution | Smelt like modelling glue | Equations: 1. A) CH3COOH -> CH3COO- + H+ B) 2CH3COOH + Mg ---> (CH3COO)2 Mg + H2 C) CH3COOH +NaHCO3--->NaCH3COO + CO2 +H2O D) 2CH3COOH + CuO ---> (CH3COO) 2Cu + H2O E) Method 1. Set up a testube rack, with 5 test tubes. 2. Within each testube add 5cm3 of ethanoic acid 3.
4. Submerge the bag in the beaker and leave overnight. 5. Dry off the bag and then record its mass. After this write down the color of the bag and the beaker solutions and then test the bag and beaker solutions for the presence of glucose.
Have the helper get ready with the stop watch, while you get ready with an Alka-Seltzer tablet. (don’t break the tablet) Count one–two–three. On three, the helper starts the stop watch and you drop the tablet into the water. c. Stir the water. (Use the same stirring speed for all of your
Wipe off excess blood from the capillary tube with a Kimwipe. 11. Seal one end of each tube with a small amount of clay material at a 90( angle. 12. After collecting amount of blood needed, hold a gauze pad over the puncture site for a short time to stop the bleeding.