I added two *Floc-Ex Tablets .I Cap the tube and mix until the tablets have disintegrated. I removed the cap. I added one heaping teaspoon of soil. I cap the tube and shake for one minute. I let the tube stand until the soil settles out.
Pour the contents of one of the test tubes into the other and a reaction should occur and you should see a white precipitate of barium sulfate form. Then, centrifuge it for 1 minute. On the side, weight a boiling test tube containing 2 boiling chips. When the separation is complete, remove the small test tubes from the centrifuge and decant the supernatant into the boiling test tube. Add 1 mL of deionized water to the small test tube containing the precipitate and mix it and centrifuge it for 60 seconds.
Procedure 1. Begin to prepare an EDTA solution. Weigh out 3.62-3.64 g of NaH2EDTA and record exact mass. Add the weighed amount to a 250 ml volumetric funnel carefully using a funnel Wash the funnel with water to ensure all of the solid is delivered to the flask Add 100-200 ml of water and mix. Enough water should be added so that the flask is full to the 250 ml mark Tightly wrap the top of the flask with a Parafilm when finished 2.
Obtain a clean-dry test tube. Place 0.3g of the unknown substance in the test tube. Next, add 10mL of distilled water to the test tube. Mix with a stirring rod until unknown is dissolved. 2.
Repeat this two more times 5. Use a pipet to put 10 ml of the appropriate solutions in each bag: Bag 1: 10 ml – 10% sucrose Bag 2: 10 ml – Distilled Water Bag 3: 10 ml – 10% Sucrose 6. Squeeze as much air as possible out of the tubes and tie the remanding open sides shut. 7. Make sure to cut the excess string hanging off of each bag.
To make the clay, 250 mL of distilled water was heated in a 600 mL beaker to 70° to be used as a hot water bath for the Erlenmeyer flask. 40 mL of distilled water was added to the flask along with .80 g of FeCl3, .40 g of FeSO4-, and .30 g of Bentonite. Using tongs, the flask was stirred in the hot water bath to disperse the iron compounds and the clay. The flask was then taken out of the hot water bath and 20 mL of NaOH was added drop-wise. After it was properly cooled, the solution was equally distributed to four centrifuge tubes and centrifuged for 5 minutes.
The aspirator was turned to medium high, and then the copper was poured onto wetted filter paper. Using distilled water to remove all copper from the beaker. Once completely on filter paper 6mL of acetone was added to the copper to help dry it out. The filter paper was then removed and set down to dry completely. Once dry the filter paper was weighed with the copper on it and subtracted from the original weight to see the amount of copper left after
Procedure: 1. Fill a beaker two-thirds full of water and add approximately 20 drops of IKI. Write down the solution's color and record the mass of the bag. 2. 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.
Caloric Content of Food Exercise 1: Determination of Caloric Content of Three Foods Abstract: First I gathered all the equipment needed. Then I zeroed out my balance and measured the mass of the empty beaker. I then put 50mL of water in the beaker and measured the mass again. I put a piece of foil at the bottom of my burner stand and then placed the beaker with water on the beaker stand. I then took the initial temperature of the water.
Eggshell Titration Lab Report LIU-1 Mr. Silva Beko Liu February 25, 2012 Purpose: Eggshells are composed in part of calcium carbonate. Calcium carbonate reacts with an acid to produce carbon dio xide, water, and a salt. The calcium carbonate in the sample eggshell will be determined by means of an acid/base back-titration. Procedure: 1.Wash an empty eggshell with distilled water and carefully peel all the membranes from its inside. Place all of the shell in premassed breaker and dry the shell in the drying oven at 110 degree Celsius.