A coin needs to be used to extract pigments from the spinach leaf cells. Place a small section of the leaf on the top of the pencil line. Then place the chromatography paper in the cylinder so that the pointed end is barely in the solvent, make sure not to get the pigment in the solvent. Mark the bottom of each pigment band. Then measure the distance of each pigment starting at the bottom of the pigment origin to the bottom of the separated pigment band.
Magic marker inks are often mixtures of several compounds. Paper chromatography is a common method of separating various components of a mixture. After separation, you can observe the different colors that make up a particular color of magic marker ink. You can also calculate a ratio Rf, which compares how far each compound traveled to how far each solvent (substance that dissolves another substance) traveled during the experiment. Rf = Ds/Df Ds = Distance traveled by the compound Df = Distance traveled by the solvent Materials: coffee filter, tape, isopropyl alcohol (rubbing alcohol), water, 3 different color magic markers (not permanent); 3 identical tall, narrow drinking glasses; metric ruler, 3 pencils Pre-lab Questions: List one extensive and one intensive property of marker ink.
Add color indicator 4. Obtain a burette and fill it with NaOH 5. Titrate the 10 mL with NaOH until it turns pink 6. Weigh a dry funnel with a filter paper and record the weight 7. Obtain an Erlenmeyer flask that has a vacuum opening and attach the vacuum tube to it 8.
Allow the mixture to cool for a few minutes then filter it, using either gravity or vacuum filtration. (We shall be using vacuum filtration.) Wash the residue in the funnel once with a little water and collect all the filtrate. 4. Pour all the filtrate and washings into a 250cm3 volumetric flask.
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
For the first solution, pour 5 grams of sugar into 250ml graduated cylinder and add water up to the 250ml mark. Place the plastic covering on the top of the cylinder and mix the contents. When finished, place the contents into the sauce pan. Fill up the cylinder, again, with 250ml of water and place into the same sauce pan. Heat the mixture
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
While stirring, 6 M NaOH was added drop-wise until the solution became basic, turning red litmus paper blue. A total of 3.84 mL NaOH was required to achieve this; the resulting solution appearing dark blue with cloudy precipitates. The solution was then heated gently atop a hot plate to catalyze the next reaction, with care taken to assure all residue was kept off the walls of the beaker. Heating continued until the reaction reached completion and the solution slowly changed from blue to a dark green and finally black. At this point the heat was turned off to allow the black solid in the beaker, CuO, to settle to the bottom.
6. Combine the iron and copper (II) sulfate together into the distilled water. Heat to a slow boil for 10 minutes. 7. Remove from the heat and allow to cool until you can hold it.