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.
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.
Objective The objective of this lab is to find the formula of an ionic compound. Materials: Copper Chloride Iron Chloride Sodium Hydroxide Well plate Indicator Toothpicks safety goggles pipets Procedures - collect materials label pipets according to the solutions inside. (CuCl, FeCl, NaOH, and the indicator) Using the pipet with the CuCl place 5 drops in the 5 wells in the well plate. Place one drop of indicator in those 5 wells. Starting on the 1st well place one drop of the NaOH at a time and mix with a toothpick until the NaOH has dissolved.
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
5a. Place a small amount (the size of an aspirin tablet) of copper II sulfate pentahydrate in a clean dry test tube and record your observations. Using your test tube holder, tilt the test tube and gently heat the contents for 4-5 minutes, while recording your observations. Make sure to observe the upper end of the test tube while heating. Allow the test tube to cool and record your observations.
Cylinder was rinsed with distilled water. * * 2. 2.0 ppm standard: 2.00 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 2. Cylinder was rinsed with distilled water. * 3.
4. Record the pH measurements in your table. 5. Rinse the beaker thoroughly, and pour into it another 25ml of tap water, and add 0.1M NaOH drop by drop, recording the pH changes in exactly the same way as for the 0.1M HCl. 6.
Transfer the distillate via Pasteur pipet into a 15-mL centrifuge tube. Wash the distillate with two 2.5-mL portions of water, removing and setting aside the water layer at each step. Transfer the organic material to a small, dry Erlenmeyer flask, leaving behind the last drops of the water layer. Remove any drops of water that were accidentally transferred to the Erlenmeyer flask, if any, then add small amounts of anhydrous sodium sulfate as drying reagent. When the liquid is dry, it will be transparent and some of the drying agent will flow freely like beach sand.
Then 5mL of HCl was added to copper to completely remove all traces of zinc. Once the bubbling had stopped, the rest of the liquid was decanted away from the copper. Then the copper recovery set up was put together using tubing, Buchner funnel, filter paper and suction flask. Then the filter paper was weighed before placing it in the funnel and wetted down. The aspirator was turned to medium high, and then the copper was poured onto wetted filter paper.
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.