Soon, the dark red changes into black and then eventually lighter and lighter becomes colorless. The colorless solution is an indication that the reaction is complete. After adding 2mL of water, a “cloudy” precipitate forms but it wasn’t clear enough. Therefore, another 5mL of deionizer water wash added. After swirling for 1 minute more precipitate was formed.
• 2, 1/2 cups flour • ½ cup salt • 1 Tbsp Alum • 1 package unsweetened Kool-Aid (6 g Pkg.) • 1 to 2 Tbsp cooking oil • 2 cups boiling water Mix all together and knead well. Gluten-Free Play dough (Nonedible) This too is an excellent recipe. It’s just as good as any regular play dough recipe. It is for children with wheat allergies.
Zinc ion and Iodine-iodide-triodide ion in water: It was a liquid solution in a bottle, it was very dark orange-brown color. Solid Zinc Iodide: A very white powdery substance that had several clumps within it. It was also very dry in nature. Mass Table Substance Amount of Mass Measured for Actual Mass Granular Zinc 2.0 grams 1.9 grams Iodine Crystals 2.0 grams 2.1 grams Observation of Reaction Shown below and Included within the lab notes on pages 12 and on page 14. Placing Acetic Acid in Zinc and Iodine test tube After placing the Acetic Acid in a normally unreactive test tube containing Zinc and Iodine, the solution changed to a more orange and then to a more red-brown color.
The oil later added simply stayed in the middle between the liquid and the suds at the top. Analysis: 1. The substance MSG is water soluble, it completely dissolved when added to water, but was not soluble in alcohol. 2. Vegetable oil is hydrophobic and there for is not water soluble but alcohol on the other hand is completely soluble with vegetable oil.
This was so that the mussel samples would not go bad due to heat or harsh solvents. They were extracted with a mild solvent, and then concentrated by evaporation. The team found that the vapor was not toxic, but the residue after was. Other extractions were done to see how the residue separated when added with other mixtures of nonpolar solvents. In the toxic mussels, the visible light absorption spectrum revealed a pattern that was characteristic of phytoplankton pigments.
The MgSo4 absorbed the last traces of water the ether solution. The solution was completely dry when it appeared crystal clear and MgSO4 floated in the liquid, when swirled. If solution is cloudy, more drops of MgSO4 were to be added until solution was completely dropped. 5) We decanted the solution from the solid MgSO4 into a 50 or 100 ml round bottom flask. 6) The ether was removed using the rotary evaporator.
2. Pour the tetracosane crystals onto a clean sheet of paper and crush them into a fine powder with the back of a spoon. 3. Place a small amount of the tetracosane crystals into the open end of a glass capillary tube, but be very careful to not break the thin tube--
Also a very pale purple tint formed. Acid test: Added 2 mL of 1M NaOH- no Physical change was observed. Base test: Added 2 mL of .17M Acetic acid- No physical change observed. Table: Zinc (g) | Iodine (g) | Deionized water (mL) | Weight of boiling tube (g) | 1M NaOH(mL) | .17M Acetic acid (mL) | 2 | 2.01 | 5 | 40.73 | 2 | 2 | 2. Answer to focus question: Since it is amphoteric, it will act as an acid if reacts with base and act as a base when reacts with acid.
The experimenter used 3 identical plastic cups and filled one with room temperature tap water, one with warm tap water and one with boiling tap water. Each cup was placed into the freezer and was checked every 15 minutes for signs of freezing. The experimenter found that the room temperature water showed the first signs of freezing and in the final outcome froze solid before the water in the other cups. His findings showed that water containing impurities, such as tap water, will freeze faster based on a lower starting temperature. The second case study was covered in an article by Science News.
Which contaminant seemed to have the most potent effect on the water? The effects of the contaminated water were that the mixture showed each water type to have a brown color to them. The water type that seemed to have both a surprising and potent effect was the water and soil mixture. I would have thought with using strictly water and potting soil the water turned the darkest brown out of all the other contaminants that I used for the mixture. The vinegar and soil mixture seemed to have cleaner look to them.