The presence of a colored precipitate represents a pattern in the electron configuration of cations. When the outer p orbital of the ion of the metal is full, the precipitate of the product is white and no other color is present. When the outer d orbital of an ion is not completely full, the precipitate of the product is a true color. When the d orbital is completely full, the color of the precipitate is not a true color. Magnesium sulfate, aluminum chloride, and calcium chloride had a white precipitate after reacting with sodium hydroxide. Sodium chloride remained a clear liquid. The ions of magnesium, aluminum, calcium, and sodium have complete outer p orbitals and have no d orbitals. The precipitates and/or the liquids were colorless because
The purpose for this experiment was to determine why it was not possible to obtain a high percent yield when Calcium Nitrate Ca(〖NO_3)〗_2 with a concentration of 0.101 M was mixed with Potassium Iodate KIO_3 with concentration of 0.100 M at varying volumes yielding Calcium Iodate precipitate and Potassium Nitrate. Filtration was used to filter the precipitates of the solutions. The percent yield for solution 1 was 87.7%, and the percent yield for solution 2 was 70.8%. It was not possible to obtain a high percent yield because Calcium Iodate is not completely soluble and some of the precipitates might have been rinsed back to the filtrates when ethanol was used to remove water molecules in the precipitate.
The purpose for this lab was to use aluminum from a soda can to form a chemical compound known as hydrated potassium aluminum sulfate. In the lab aluminum waste were dissolved in KOH or potassium sulfide to form a complex alum. The solution was then filtered through gravity filtration to remove any solid material. 25 mLs of sulfuric acid was then added while gently boiling the solution resulting in crystals forming after cooling in an ice bath. The product was then collected and filter through vacuum filtration. Lastly, crystals were collected and weighed on a scale.
The purpose of the Unknown White Compound Lab was to identify the unknown compound by performing several experiments. Conducting a solubility test, flame test, pH paper test, ion test, pH probe test, conductivity probe test, and synthesizing the compound will accurately identified the unknown compound. In order to narrow down the possible compounds, the solubility test was used to determine that the compound was soluble in water. Next, the flame test was used to compare the unknown compound to other known compounds such as potassium chloride, sodium chloride, and calcium carbonate. The flame test concluded that the cation in the unknown compound was potassium. Following, pH paper was used to determine the compound to be neutral and slightly
Dehydroascorbic acid and iodide ions are produced when ascorbic acid and iodine solution are mixed. Iodine has a brown color in solution whereas iodide
HYPOTHESIS: My hypothesis is that none of the Crayola colors are pure colors because they are a mixture of other color components.
Helmenstine, Anne M. "Colored Snow Chemistry - Causes of Colored Snow." About.com Chemistry. N.p., n.d. Web. 2 May 2014. .
Why do we observe the color of the solution before adding the sandwich bags to each cup?
The project I am interested in doing is to make a color magnitude diagram of a star cluster, which will result in a graph similar to an HR diagram. The open star cluster I have chosen is NGC 457, or the Owl Cluster. I chose this one because it is easily observable with right ascension of 01h 19m 32.6s and Declination +58° 17′ 27″. NGC 457 is roughly above the air mass of 1.5 between the hours of 2100 to 0600 towards the end of October. The open cluster is in the constellation Cassiopeia, and is fairly bright without having a high density of stars. This ensures I will be able to observe it with ease, and there will not be too many stars which could potentially cloud my data. I will be plotting the color magnitude along the x-axis and the apparent magnitude of the stars within the cluster.
In our experiment we utilized the hydrate cobaltous chloride. Hydrates are crystalline compounds in which one or more molecules of water are combined with each unit of a salt. Cobalt (II) chloride hexahydrate is an inorganic compound which is a deep rose color in its hydrated form. As an inducer of
Since ionic liquids do not crystallize when cooled, they can not be purified by the crystallization. They tend to have yellow to brown coloration caused because of the contaminations. Stirring the liquid in liquid activated by charcoal and then passing it through a column of alumina usually remove the color.
Four solutions were tested an out of the four only one had a color change, meaning that it had alcohol present. This solution was methanol and of course it would produce a color change because methanol is an alcohol. One solution that should have changed color was solution 4, the base-hydrolyzed aspartame, but it did not produce a color change when aqueous ceric ammonium nitrate reagent. Water and fresh aqueous aspartame are not going to produce a color change because there is no alcohol group in there structure.
[9] existent after the large area of colour was drawn because of the way the colour had been applied and dissolved.
Chemwiki UCDAVIS (n.d) claims that the colour of a coordination compound can be determined by using the Crystal field theory. These colours are then used for the creation of pigments that are used for dyes in the industry of textiles. Coordination compounds are able to form these colours because their absorption energy falls within the range of the visible light spectrum. The colour that is visible in all chemical compounds is an indicator of the physical properties of the substance at an atomic level. When ligands are bonded to a transitional metal when forming a coordination compound, a split of the d-orbital occurs.
neutralized by the base. The point was signaled by a changing of color of an
Chemical weathering happens when rocks formed deep underground are exposed to environmental conditions at the earth surface. The process, which is rocks being broken apart or chemically altered to become sediment is weathering. Which is also caused but the temperatures and pressures that are transformed into the types of chemical compounds. The chemical compounds are exposed to the air and water at the surface. Chemical weathering does not make smaller fragments of rocks through wind, water, and ice it changes the composition of the rock by carbonation, hydration, hydrolysis or oxidation. The three main type of chemical weathering is Hydrolysis, Oxidation, and Dissolution with the chemistry behind them.