BE READY WITH THE STOPWATCH. Record the time in the data table. Room Temperature Water: Fill beaker with 80mL of water. Use thermometer to record the temperature Drop Alka-Seltzer tablet in water. Measure the time it takes to completely dissolve.
Add 1 mL of deionized water to the small test tube containing the precipitate and mix it and centrifuge it for 60 seconds. Then, add the supernatant into the boiling test tube and repeat this step one more time with another 1 mL of deionized water. Acquire a pair of metal test tube holders and heat the boiling test tube to evaporate the water for 15 minutes. Let is cool after and weigh it. Then, calculate a percent yield of zinc iodide and write a balanced chemical equation and determine the limiting
2. Add 0.6g of zinc into the beaker. Mix the zinc with a stir rod. 3. Then, wait at least ten minutes for the zinc to settle.
Glen Mings CHEMISTRY 1 SUMMER 1 Experiment 9 Report Submitted: June 28, 2015 Title: Determination of Water Hardness Using a Titrator Purpose: To find out how “hard” my tap water is; specifically the concentration of calcium carbonate in ppm, and compare it to the four classifications. Procedure: Using a titrator, I measured how much EDTA solution it took to bond all of the Ca2+ ions, which was determined when the EBT turned from purple to blue. And since the reaction is 1:1 stoichiometric, we can assume that the moles of EDTA used equal the moles of calcium ions. Data Collected: | Initial EDTA volume | Final EDTA volume | Total volume of EDTA used | Trial 1 | 7.0 ml | 6.6 ml | 0.4 ml | Trial 2 | 6.6 ml | 6.3 ml | 0.3 ml |
Gather all materials 2. Heat 200mL of water in the beaker for 90 seconds 3. Place the bulb of one thermometer just below the surface of the water 4. Record the initial temperature at the top 5. At the same time, place the second thermometer bulb just at about the bottom of the beaker 6.
Then, 3.4 g of ammonium sulfate was slowly added to the supernatant 1 as it was stirred for 15 min to achieve 50% saturation (85g/L of solution). The supernatant was then centrifuged at 9000 x g and 40C for 15 min and 5 ml of the second supernatant was transferred to a conical tube. The obtained second pellet was resuspended in 4 ml of distilled water and transferred into another dialysis
Sac #1 placed into beaker #1 with distilled water, sac #2 placed into beaker #2 with 40% glucose solution and so forth. 3. Before analyzing, we had to allow sacs to remain undisturbed in the beaker for 1 hour. 4. After 1 hour we boiled a beaker of water on the hot plate (for Benedict’s and AgNO3 test).
Take one pipette and fill each test tube with different amounts of Pb 4. Wait 20 minutes 5. Measure the height of the solid in each test tube.
polyolefin elastomer (Tafmer DF640) with a melt flow rate of 3.6 g/10 min (190 ℃/2.16 kg, ASTM D1238) was prepared from Mitsui Chemicals (Japan). The applied peroxide was DCP from Hercules (New York, USA) in a powder form and xylene was also obtained from Merck. 2.2 Sample preparation 2.2.1 Synthesis of octavinyl polyhedral oligomeric silsesquioxane (OVPOSS) (from dr karimi…) 2.2.2 Preparation of composite samples Before blending, POE and OVPOSS were dried at 80℃ under vacuum for about 12 h to remove the excess moisture. The POE-POSS-DCP blends were prepared in a Brabender internal mixer (WTH 55, Germany) with a mixer bowl capacity of 55 cm3 and roller-type rotors at 90℃ with mixing duration of 8 min and rotor speed of 60 rpm. The blends were preheated for 1 min in a hot press (Toyoseiki, Japan) and then compression molded at 190℃ for 5 min under 25 bars pressure.
The resulting product was [Co(NH3)5Cl]Cl2 and yield was 4.453g (.017 mol, 84.8%) Distilled water (25mL) was added to concentrated ammonia (5mL) in a 125mL Erlenmeyer flask. The reaction was heated and stirred, then [Co(NH3)5Cl]Cl2 (.0060 mol) was added to the solution. The reaction mixture was vacuum filtered, and the filtrate was cooled in an ice bath. 6M HCl was then added until the solution was neutral to litmus. NaNO2 (.0217 mol) was added to the solution and was allowed to react for five minutes.