Fill the test tube about half way with distilled water and insert the thermometer. 4. Place the test tube assembly in the 24-well plate as a secure place to hold the test tube. 5. Read the thermometer, to the hundredths place, until the temperature is stable.
Measure approximately 1 g of Copper(II) Sulfate Hydrate into the crucible and crucible and lid. 4. Heat the crucible gently. 5. Stirring carefully and observe the color of the hydrate until it changes to a consistent white color, then the Copper(II) Sulfate is dehydrated.
Do an initial Benedict's test on the 15% glucose/1% starch and the beaker solutions for glucose by putting some of the solution and a roughly equal amount of blue Benedict's solution in a test tube, placing the test tube in boiling water for 90 seconds, and observing whether or not the solution changes color from blue. 3. Form a bag out of dialysis tubing by tying off one end, putting in enough 15% glucose/1% starch solution to fill it halfway, and tying off the other end leaving the other half of the bag void of anything (even air). Write down the solution's color. 4.
A melting point will be ran on the aspirin when completely dry. A capillary tube containing the dry aspirin will be placed into the melting-point apparatus. This process is to determine the melting point range of aspirin. First, a hot water bath was created with a 400. mL beaker on a hot plate. The temperature was raised to 70 degrees Celsius and 4.419 g of salicylic acid was measured out on a balance and transferred into a 125. mL Erlenmeyer flask.
A voltmeter was used to measure the electrical resistance of different solutions. * Experiment and Observation: The plastic and glassware used in this experiment was thoroughly washed with hot water and rinsed with distilled water. * * Part I: Preparation of Standard Phosphate Solutions 1. 1.0 ppm standard: 1.00 mL of 10.0 ppm phosphate solution was placed in a 25 mL graduated cylinder and diluted to exactly the 10 mL mark with distilled water then poured into a plastic cup labeled 1. Cylinder was rinsed with distilled water.
Begin by adding 1 mL of rubbing alcohol to test tube and attach a thermometer to it. b. Place assembly in water bath and begin to heat beaker c. As isopropyl alcohol begins to boil, bubbles begin flowing from the capillary tube d. While temperature is decreasing, record the temp. when the last air bubble comes out of the capillary tube. e. Let assembly cool down and repeat process two more times.
c Use the syringe to place 2 cm3 of amylase into the test tube. d Add 1 cm3 of buffer solution to the test tube using a syringe. e Use another syringe to add 2 cm3 of starch to the amylase/ buffer solution. Start the stop clock and leave it on throughout the test. Mix using a plastic pipette.
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.
For the OxiClean solution, try this recipe: 1 cup water ½ cup hydrogen peroxide ½ cup washing soda Mix all of the ingredients together and store the solution in a dark spray bottle. The hydrogen peroxide will lose its effectiveness if light penetrates it. Spray the solution on soiled laundry and let it sit overnight. If you have a few articles of clothing that are soiled, make a batch and soak them in a machine or in the sink overnight. The homemade OxiClean recipe can be used in the carpet cleaning solution.
Blood glucose levels then slowly declined for each successive measurement. Levels decreased an additional 25.1 mg/dl to 118.9 mg/dl at the 60 minutes measurement, 3.3 mg/dl to 115.6 mg/dl at 90 minutes, and 14.6 mg/dl to 101.0 mg/dl at 120 minutes. At the two-hour measurement, the blood glucose level was 12.3 mg/dl over the baseline measurement of 88.7 mg/dl. For the control group, consuming 296 ml of water did not greatly affect blood glucose levels. The trend was a slight decline from the baseline measurement of 99.0 mg/dl to the two-hour measurement of 89.4 mg/dl.