How to Do a Flame Test for Qualitative Analysis

The flame test is used to visually determine the identity of an unknown metal or metalloid ion based on the characteristic color the salt turns the flame of a Bunsen burner. The heat of the flame excites the electrons of the metals ions, causing them to emit visible light. Every element has a signature emission spectrum that can be used to differentiate between one element and another. How to Do the Flame Test Classic Wire Loop MethodFirst, you need a clean wire loop. Platinum or nickel-chromium loops are most common. They may be cleaned by dipping in hydrochloric or nitric acid, followed by rinsing with distilled or deionized water. Test the cleanliness of the loop by inserting it into a gas flame. If a burst of color is produced, the loop is not sufficiently clean. The loop must be cleaned between tests. The clean loop is dipped in either a powder or solution of an ionic (metal) salt. The loop with sample is placed in the clear or blue part of the flame and the resulting color is observed. Wooden Splint or Cotton Swab MethodWooden splints or cotton swabs offer an inexpensive alternative to wire loops. To use wooden splints, soak them overnight in distilled water. Pour out the water and rinse the splints with clean water, being careful to avoid contaminating the water with sodium (as from sweat on your hands). Take a damp splint or cotton swab that has been moistened in water, dip it in the sample to be tested, and wave the splint or swab through the flame. Do not hold the sample in the flame as this would cause the splint or swab to ignite. Use a new splint or swab for each test. How to Interpret Flame Test Results The sample is identified by comparing the observed flame color against known values from a table or chart. RedCarmine to Magenta: Lithium compounds. Masked by barium or sodium.Scarlet or Crimson: Strontium compounds. Masked by barium.Red: Rubidium (unfiltered flame)Yellow-Red: Calcium compounds. Masked by barium. YellowGold: IronIntense Yellow: Sodium compounds, even in trace amounts. A yellow flame is not indicative of sodium unless it persists and is not intensified by an  addition of 1% NaCl to the dry compound. WhiteBright White: MagnesiumWhite-Green: Zinc GreenEmerald: Copper compounds, other than halides. Thallium.Bright Green: BoronBlue-Green: Phosphates, when moistened with H2SO4 or B2O3.Faint Green: Antimony and NH4 compounds.Yellow-Green: Barium, manganese(II), molybdenum. BlueAzure: Lead, selenium, bismuth, cesium, copper(I), CuCl2 and other copper compounds moistened with hydrochloric acid, indium, lead.Light Blue: Arsenic and some of its compounds.Greenish Blue: CuBr2, antimony PurpleViolet: Potassium compounds other than borates, phosphates, and silicates. Masked by sodium or lithium.Lilac to Purple-Red: Potassium, rubidium, and/or cesium in the presence of sodium when viewed through a blue glass. Limitations of the Flame Test The test cannot detect low concentrations of most ions.The brightness of the signal varies from one sample to another. For example, the yellow emission from sodium is much brighter than the red emission from the same amount of lithium.Impurities or contaminants affect the test results. Sodium, in particular, is present in most compounds and will color the flame. Sometimes a blue glass is used to filter out the yellow of sodium.The test cannot differentiate between all elements. Several metals produce the same flame color. Some compounds do not change the color of the flame at all. Because of the limitation, the flame test might be used to rule out the identity of an element in a sample, rather than definitively identify it. Other analytical procedures should be conducted in addition to this test. Flame Test Colors This table lists the expected colors for elements in the flame test. Obviously, the names of the colors are subjective, so the best way to learn to recognize close-colored elements is to test known solutions so you know what to expect. Symbol Element Color As Arsenic Blue B Boron Bright green Ba Barium Pale/Yellowish Green Ca Calcium Orange to red Cs Cesium Blue Cu(I Copper(I) Blue Cu(II) Copper(II) non-halide Green Cu(II) Copper(II) halide Blue-green Fe Iron Gold In Indium Blue K Potassium Lilac to red Li Lithium Magenta to carmine Mg Magnesium Bright white Mn(II) Manganese(II) Yellowish green Mo Molybdenum Yellowish green Na Sodium Intense yellow P Phosphorus Pale bluish green Pb Lead Blue Rb Rubidium Red to purple-red Sb Antimony Pale green Se Selenium Azure blue Sr Strontium Crimson Te Tellurium Pale green Tl Thallium Pure green Zn Zinc Bluish green to whitish green Source Langes Handbook of Chemistry, 8th Edition, Handbook Publishers Inc., 1952.

The Definitive Approach for Professional Development Essay Samples

The Definitive Approach for Professional Development Essay Samples Leadership comes in several ways no matter the position at work stratification in relation to the rank. The available opportunities also significantly helped in the progression of the feasible mechanisms to effectively realize the necessary development plans. Ongoing professional development is the sole method to make sure that you're competent and skilful in your role. The growth of leadership skills is vital since they help to attain both personal and professional success. Planning is essential as it provides a medium for someone to set goals and choose how they will need to be achieved. Everyone else was prepared to begin the meeting on the hour. All About Professional Development Essay Samples The very first thing we should cover is what you may include in the professional development section. More information is probably going to be available about why certain methods are somewhat more powerful than o thers. If you're looking for assistance with your essay then we provide a comprehensive writing service given by fully qualified academics in your area of study. A great access of information also provides a great chance to enhance my academic and expert performance. The personal development program is quite significant in enabling the tracking of developmental changes that are essential for the achievement of set goals. Most careers require that the individual has specific understanding, education, or a particular degree once it comes to furthering or advancing in their career. A promotion will normally be a long-lasting goal that you're able to work towards overtime. Remember, it is a very long journey of up and downs. A career is just one of the most essential things in your life, and with the properly planned career and career targets, you'll be in a position to achieve what you would like from your career in the most effective way possible. When you set goals, you own a path for your trip. To keep from veering off track, it's helpful to prepare career objectives. Using Professional Development Essay Samples There hasn't been any significant difference in my performance, which isn't satisfactory. At first, the achievement of certain expert expertise is the desire of the majority of professionals. Moreover, it's also a means to make sure that the expert placement experience time is effectively managed by planning about what to do and what things to reach. In the example of communication or customer care, training and continuous appraisal will be done in order to guarantee effectiveness. As professionals, acquiring a goal makes it poss ible for us to come to work each day with a very clear purpose in mind. You might not be too fond of some individuals, but it's still true that you will need to understand how to set your own personal differences aside. Rather than waiting for individuals to apply for jobs, very good organizations are always watching for high-caliber folks. In the same manner, organizations always have the urge for increasing the caliber of the creation and also competitively positioned on the market. Today, the part of leaders is extremely critical for the successful performance of various organizations. Personal learning activities like spending more time in the library conducting research on some essential facets of my professional field will likewise be considered. An expert development section can actually help you distinguish yourself from the competition. As a working professional, there are lots of tactics to broaden your knowledge, including enrolling in many courses, attending work shops and training programs, getting certificates, and much more.

Landscapes from the Age of Impressionism Free Essays

Born in Florence, Italy having American parents, the most flourishing portrait painter during his time John Singer Sargent becomes a part of an exhibition at the Virginia Museum of Fine Arts, through his eye-catching landscapes and masterpieces. During his time, the world of art is dominated by Cubism, Fauvism and Impressionism. However, John Sargent accomplished his masterpieces through his own form of Realism. We will write a custom essay sample on Landscapes from the Age of Impressionism or any similar topic only for you Order Now His skills, as well as his form, were honed under the tutelage of Emile Auguste Carolus-Duran in Paris from 1874 to 1878, after studying rigorously in both Italy and Germany. John Sargent’s paternal grandfather was a Spanish descent and he carefully studied the paintings in the Prado during an extended residency in Madrid from 1866 to 1868 (Boone, 117). Constantly the internationalist, John Sargent journeyed by train from Paris to Madrid, and he was in the Prado by October 14, and the several of copies that he completed, such as the painting of a dwarf then credited to Velasquez and a detail of Velasquez’s â€Å"Las bilanderas† in 1879, recommends or advocates a stay of just more than one month. Sargent also has several collections of photographs after Velasquez’, â€Å"Don Antonio el ingles† and â€Å"Las Bilanderas†. In addition to this, he also had â€Å"The Surrender of Breda†, â€Å"the Forge of Vulcan† and â€Å"Las meninas†, which he stored or set aside in a scrapbook. These photographs served as souvenirs from his trip as well as reference material for his study of art history, and motivation for fresh works of art (Boone, 280). John Singer Sargent is fond of life. John Sargent finds the the people portrayed rather than the setting to be exotic. His love for life, as well as being a painter, can be observed in some of his masterpieces such as in â€Å"Dolce Far Niente† and â€Å"The Sketchers†. â€Å"The Sketchers† (1856-1925) is John Sargent’s 22 by 28 inches masterpiece which uses oil on canvas as medium. The Virginia Museum of Fine Arts was able to acquire this artwork through the help of Arthur and Margaret Glasgow Fund, in the year 1958. In â€Å"The Sketchers†, there is an interplay of light and dark or chiaroscuro which can be instantly recognized. The left side of the painting shows scuro (dark), while the right side shows chiaro (light). The chiaro can be observed through the shadows and darker shade or hue of colors used through the trees and on the left side of the white umbrella. In addition to this, the background â€Å"sky† on the left side is darker as compared to that on the left side. These darker shades or shadows are results of the light from a source which can be observed to be coming from the right side of the painting. How to cite Landscapes from the Age of Impressionism, Papers