| Experiment #3Weight of Zinc: 2.0 gramsWeight of Iodine: 1.1 gramsExperiment #6Weight of Zinc: 2.02 gramsWeight of Iodine: 2.5 grams | 3. Then add 5 mL of acetic acid (acidified water) into the “R” boiling tube, and then after you pour it swirl vigorously. Continue swirling until the tube turns back into room temperature. Then you have to decant the solution in boiling tube “R” into boiling tube “P” without any granular zinc leaving boiling tube “R”. Then wash the zinc in the boiling tube “R” by adding 5 mL of acidified water, swirling and then decanting the solution into the “p” boiling tube.
| Experiment #3Weight of Zinc: 2.0 gramsWeight of Iodine: 1.1 gramsExperiment #6Weight of Zinc: 2.02 gramsWeight of Iodine: 2.5 grams | 3. Then add 5 mL of acetic acid (acidified water) into the “R” boiling tube, and then after you pour it swirl vigorously. Continue swirling until the tube turns back into room temperature. Then you have to decant the solution in boiling tube “R” into boiling tube “P” without any granular zinc leaving boiling tube “R”. Then wash the zinc in the boiling tube “R” by adding 5 mL of acidified water, swirling and then decanting the solution into the “p” boiling tube.
By ways of decanting (using a class stirring rod to guide solution), pour the solution into the funnel until it is about half an inch from the top. The solution should be clear and colorless 8) Allow the flask to cool. While the flask and solution are cooling, wash the funnel and beaker with LOTS of tap water to remove all traces of KOH. Also throw away any carbon on the filter paper. 9) Once the solution is cool enough to touch, add 35mL of 3M H2SO4 (measured out in 50mL graduated cylinder) SLOWLY AND STIR CONSTANLY.
In this experiment, the salicylic acid is insoluble in cold water and can be collected by vacuum filtration. Procedure As the lab, synthesis of salicylic acid, had done, micro-scale was used. To begin, 3.5mL of water was poured into a 10 mL round-bottomed flask. And 0.48 g of sodium hydroxide was added to the flask. After the solid was dissolved, 230mg of methyl salicylate was added using a graduated pipet to the NaOH solution.
Taking the A train Chemistry Lab 106 Lab Report: Taking the A train Experimental Procedure/Observation for Part I In this experiment our objective was to determine why we used acidified water when we reacted zinc with iodine. We began by weighing an empty boiling tube which was 40.99 grams. Next we added two grams of granular zinc to the aforementioned boiling tube. Then, we added two grams of iodine to the boiling tube already containing the zinc. After that we added 4.99 mL of deionized water to the boiling tube and began swirling the substances until the reaction was completed.
Write down everything you notice. Remove test tube from water and allow it to cool for 2 minutes in a small beaker of tap water. Add about 7.0 mL of 1M hydrochloric acid to the tube. Mix chemicals very thoroughly with a stirring rod. Record how long it takes for change to happen.
Mount the buret on the ringstand and fill it above the zero mark with the prepared sodium hydroxide solution. Open the stopcock and allow the buret to drain until the liquid level is at zero. Make sure all the air bubbles are out of the tip of the buret. Read and record the intial buret reading to the 0.01mL. Place the 125mL flask containing the first KHP
Next, obtain a 5 mL serological pipet and thoroughly rinse it with the buffer solution, then discard the buffer solution into the 250 mL beaker. Now, use the pipet to distribute 5 mL of the buffer solution into three 50 mL beakers. Be sure that the 50 mL beakers have been cleaned are dried prior to this. Next, locate the three pre filled burets in the lab room. Find the buret labeled 1.0M HCl and add exactly 1.00 mL of HCl to just one of the three 50 mL beakers with buffer solution already in them.
The color starts out as a reddish brown color, and then, when swirled, becomes a gold yellowish color, and slowly becomes transparent clear at the end of the reaction. As Zinc and Iodine is reacting, the bottom of the test tube would become hot, but slowly, about 5-10 minutes, will begin to cool down to room temperature. On the atomic levels, the atoms of both Zinc and Iodine are reacting causing that exothermic reaction to occur. The atoms would combine together to form ZnI2, and cause a color change because of the interaction between the particles. When the water is evaporated, a white compound of zinc iodide is formed.
To dissolve the sodium chloride in the deionized water, we placed a magnetic stirrer into each beaker and placed it on the electric stirrer. Right before titration for each beaker containing the dissolving sodium chloride, we added the indicator - K2CrO4. Afterwards, the titrant was added in dropwise amounts. During titration, the solution changed colors from yellow to white. As the titrant was being added into the solution, there was a noticeable red spot at the point of impact between the solution and the titrant drop.