1. Coffee Beans are crushed into small pieces, water is added to it and the mixture is heated over a flame. What do you think would happen to the coffee beans as it interacts with the water? Explain your prediction I think the heating of the water and coffee beans would cause the water to turn a light brown color because this process is most likely removing some kind of excess substance from the surface of the coffee beans. This happens because of the rising temperature o the mixture being heated over a flame.
2. What would happen to the water if instead of coffee beans, strips o seaweed were used? Explain your prediction. I think that instead of the liquid turning a light brown color, it would turn to a light green or light yellow color because the heating is removing a different substance off of the surface of the seaweed than it is from the surface of the coffee beans.
3. Define the following terms:
Decant – to draw off (a liquid) without disturbing the sediment or the lower liquid layers Filtrate – fluid that has passed through a filter
Extract – the part of a complex organic material that is soluble in ether and consists chiefly of fats and fatty acids Precipitate – a substance separated from a solution or suspension by chemical or physical change usually as an insoluble amorphous or crystalline solid Tincture – a solution of a medicinal substance in an alcoholic solvent Observations :
Dried Seaweed in ½ pieces (Laminara Kelp)Bunsen Burner
150 ml beakerMedium Ring for Ringstand
Distilled waterWire gauze
50 ml cylinderEvaporating dish
Glass stirring rodTincture of Iodine
Mineral OilSilver Nitrate
Iodine CrystalsSmall Test tubes
The first thing we had to do was fill a 150 ml beaker with 6 grams of dried seaweed, which we had to approximate on a weight scale. The amount of seaweed we used approximated 6.02 grams. Then, we included some distilled water and stirred the mixture with a stirring rod until the water turned a dirty yellow color. We then poured out only the water from the beaker and refilled it with distilled water. Then, we had to set up the Bunsen burner to a smaller flame to heat the mixture gently. While heating, the water in the mixture turned a dark green. We heated the mixture for approximately 5 minutes. Then, we had to filtrate the mixture.
We placed a piece of filter paper onto the inside of the funnel, having it stick to the side by squirting some water from the wash bottle. We set this up over an evaporating dish, in which the filtrate is supposed to fall into. Our filtrate came out to be 3ml, and the color was a pale yellow-green. We put this into a 50 ml beaker and placed three pieces of iodine crystals in. We crushed these crystals in with the mixture with a stirring rod. Then, it was time to test the results.
In three test tubes, we poured in one third of our home-made mixture in each test tube. In another three test tubes, we poured in the standard Tincture of Iodine, which contains iodine, iodide ion, and triiodide ion. To test for iodine, we placed 20 drops of mineral oil in one of the test tubes of standard tincture and we also placed 20 drops into our homemade tincture. If there is in fact iodine, the mixture should change into a pink or purple color. To test for iodide ion, we placed 20 drops of 0.1 silver nitrate into the standard tincture and 20 drops of 0.1 silver nitrate into our homemade tincture. If there is in fact iodide ion, the mixture should become a very foggy pale yellow color. The test for triiodide was a visual inspection. In minutes, if the mixture will turn into a brown color, then triiodide exists in the mixture.
Tabulated Results :
Test for ..
Standard Tincture of Iodine
1. How can I make a pharmaceutical product from seaweed?
We can produce a pharmaceutical product from seaweed by creating a mixture with seaweed in water, heating the extract from the mixture of seaweed and water, then finally extracting the product from the water. 2. Can a single substance be isolated from a mixture (i.e. seaweed)? What is that substance? Yes, by the process o extraction, filtration, and evaporation. The substance is tincture of iodide, used to clean and infect wounds. Confidence Report
I am confident that the data collected in this lab is “good data”. This was quite a simple lab with not many steps and no complex material samples and few containers required. Because this lab was not very complex, that means there is a very low possibility of mistakes. It also means there is a very low possibility of outside elements affecting the equipment. Samples: We believe that the samples provided by the laboratory such as the seaweed, iodine, silver nitrate, and mineral oil were clean and untouched.
We observed the characteristics of the mixture we prepared and observed through testing and concurred that nothing indicated that bad samples were provided. Our testing samples also provided us proper chemical interactions. Measurements: All measurements were made certain by everyone in the group. This helped to ensure accuracy. Observations: Since we also tested control substances along with testing our mixture, we were able to observe what the proper results should look like. Therefore, there should be no mistakes from the observations from testing our homemade mixture. After reviewing at the possible potential areas for error, I am confident that we had good data and produced good results.
Courtney from Study Moose
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