![]() ![]() ![]() But I think the blue colour is here somewhere. I guess I will have to give up on the blue color. Now I want to rinse this cloth so that I can preserve the blue color. See this experiment was successful after all. Do you see this red cloth? How about if I dip it into the colorless solution and pull the blue color out of solution on the cloth. To prove that it is still there I am going to pull the blue color out of the solution. You do not see any blue color? Well, I think the blue color is still there whether you can see it or not. There, I got my blue solution, but how do I get the battery out without getting my hands wet? ( Pour beaker-1 into beaker-2) How do you think I can make this work? What do you use to make your toys work at home? Everything needs a battery? Can a battery make a chemical reaction? Well let me try this battery. Let us see if I can pour this first chemical in my beaker and make a blue color. My favorite color is blue but all I have are these clear solutions. (Click on the blue writing to show the video) Then soak the cloth in beaker-2, and then in beaker-3.īeaker 4 contains the thymolphthalein solution prepared earlier. When the liquid is a black/blue color, pour it in beaker-2. When all set up, add starch to beaker-1 and act disappointed as if the experiment did not work. This is beaker-2.įill the third beaker with 500 mL of water and add 30 mL of 6 M NaOH. The second beaker should only contain the solid ascorbic acid. Add the solid potassium iodide to the beaker and stir until dissolved, and then add 10 mL 3 M sulfuric acid (have 5 mL of starch handy until ready to be put in). If the solutin is coloured add vinegar drop by drop until the solution is clear.įill the first beaker with 600 mL of water. The red cloth is now ready.Īdd 0.04g of thymolphthalein to 50 mL of ethyl alcohol in a beaker. ![]() Remove the cloth and squeeze out as much liquid as possible then rinse the cloth with fresh water a few times. Allow the cloth to soak in the liquid for about 15 minutes. Periodically remove the cloth and squeeze out the liquid. Make sure to wear rubber gloves to protect the skin. Place the cloth in the Congo red solution, immersing it completely. Make a 1% solution of Congo red indicator by adding 1 g of Congo red to 100 mL of distilled or deionized water. Electrical energy can be used to produce a chemical change.Ĭoncept: Oxidation and Reduction, Electrolysis, Acids and Base Indicators ![]()
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