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
I capped the tube and I mixed until the tablet disintegrates. I wait 5 minutes for the color to develop. Then I compared the blue color of the solution to the potassium color chart: L = 40 lbA/6" soil, M = 80 lb A/6" soil, and H = 160 lb A/6" soil. For the nitrogen I used the pipet to transfer 25 drops of the clear solution above the soil to a square test tube. Then, I filled the tube to the shoulder with distilled water.
5mL of acidified water will be measured, using a graduated cylinder, and will be transferred to the R tube, and will be immediately vigrously mixed with the reactants. Once the solution turns to an orange or red-brown color, a pipet will be used to quickly remove 30 drops of the solution, then transferred to the C tube, and the mixing will resume until the solution is close to room temperature. The solution will be filtered into the P tube, and the solution that is left in the R tube should be washed three times with 1mL of acidified water each time. The water should then be poured into the P tube, leaving the solid in the R tube. Using a test tube holder, heat the R tube over the Bunsen burner, moving the tube in a circular motion until all the water has evaporated.
Using another 125-mL flask, 60-mL of 0.3622 M potassium hydroxide in ethanol was deposited. Both flasks were clamped in a temperature-controlled bath regulated at 50.0˚C. The solutions were then set in the temperature bath for ten minutes to equilibrate. An empty 250-mL Erlenmeyer flask was also clamped in the same water bath. In another flask 50-mL of ice water was deposited with three-drop phenolphthalein.
Part A: Spectroscopy 1. 0.05g of Iron(III) Nitrate in a 50-ml beaker. Add 17 mL of distilled water to the beaker and mix with a stir rod until the solid is completely dissolved. 2. Obtain another 50-mL beaker and add 0.05g of Chromium(III) Nitrate to the beaker.
The seaweed will be cut and weighed (6 grams) and transferred into 150 mL solution. Using 40 mL of distilled water the seaweed is heated just under boiling for five minutes. After cooling, a filter will be used to remove the seaweed from the extract. The goal is to transfer 2-3 mL of filtrate into the evaporating dish. We now slowly pour the solution into a funnel with filter paper.
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
SYNTHESIS 3 Purifying an unknown solid by recrystallization involved preparing cobalt amine chloride product. By adding five grams of cobalt II chloride into 20ml of 9M HBR in 250 mL beaker, plus 15 mL of deionized water. Dissolving the compound within pure water, filtration by gravity and adding two grams of activated charcoal and 25 mL of concentrated. Cooled after heating and additional six mL of 30 percent hydrogen peroxide. Filter by suction then collect the dark solid.
At first we dried the crucible in the flame three times and let it come to a constant mass by measuring the weight each time. To determine percentage of water in Epsom salt, we measured about 2g of the salt into three different, dried crucibles. The crucibles were first heated gently, then intensely to drive off all the water. The final data was reported as percent hydrate with 95% confidence level. RESULTS & DISCUSSION Weights of the crucible.
Using the analytical balance 1.0537 g of the aluminum can was weighed out. The 1.0537 g of aluminum was added to 40 mL of 1.5 M KOH(aq) in a 250 mL breaker. The slurry of KOH and Aluminum was then placed on a hot plate for 30 minutes. A filtration apparatus made with 500 mL Bucher filter flask, funnel and adapter