Q: 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 answer. A: Molecules of water will interact with particles of coffee and will gradually extract it’s chemicals from it, such as caffeine, theobromine and so on. Due to high temperature the kinetic energy of water and therefore particles of coffee will be high and hence more interactions will be happening, which will make process of extracting the chemicals from coffee feasible.
Q: What would happen to the water if instead of coffee beans strips of dried seaweed were used. Explain your prediction. A: Water would interact with seaweed the same way as with beans. And because of high temperature and high kinetic energy seaweed will extract it’s chemicals into water much faster than under room temperature. Q: Define the following terms: decant, filtrate, extract, precipitate, tincture. A: Decant – to pour liquid without disturbing the sediment on the bottom of the vessel.
Filtrate – filtered mixture. Extract – substance made by extracting a part of raw material using a solvent, such as water. Precipitate – an insoluble solid formed inside of another solid or solution during a chemical reaction. Tincture – a solution of alcohol usually containing some plant or animal extract. 3. Observation Step 3. The exact weight of Kombu seaweed is 6. 06 g, appearance is dark green with whitish marks on it. Step 4. After agitation in distilled water seaweed softened up and became paler in color.
Step 5. After 5 minutes of boiling the water became greenish and much more viscous, seaweed’s texture softened up significantly. Step 7. Due to very high viscosity of the solution had to dilute it with some distilled water to fasten the filtration process. 4. Results (write down results in a table) Standard Homemade I2 Purple layer formed Mineral oil turned purplish pink I- Yellow precipitate formed Dirty yellow (with some tiny brownish inclusions) precipitate formed I3- Reddish brown color
Light brown 5. Focus Q 1. How can I make a pharmaceutical product from seaweed? By preparing a seaweed extract and mixing it in correct proportions with sodium iodide, alcohol and purified water. 2. Can a single substance be isolated from a Mixture (i. e. Seaweed)? What is the substance? 6. Confidence report 1-3 pages a. mention specific procedural steps that were done A strip of dried seaweed was cut into ~ ? inch pieces and 6. 06 gr of it was transferred into a 150 ml beaker.
The beaker then was filled with about 110 ml of distilled water and the seaweed was agitated in it using stirring rod. This was needed to get rid of monosodium glutamate that could be present on the surface of kelp. After the water was discarded into the sink and seaweed was covered with 40 ml of distilled water and heated just under boiling for 5 min on Bunsen burner. Boiling was minimized in order to prevent the evaporation of the solution. After 5 min is over the beaker was left to cool down and transferred using hands not tongs!
The resulting extract needed to be separated from the seaweed with the help of a filtering set-up and was placed into the evaporating dish. During the filtration we were able to collect about 2. 5 ml of filtrate. The resulting extract was transferred to a beaker and 3 pieces of crystals of Iodine were added to it. They were stirred and left for 10 min. After that the tincture underwent multiple qualitative tests for iodine, iodide ion and triiodide ion. To ensure the quality of data we took b. compare your results with other groups 7. Post lab Q 8. What if