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Kaliapparat
A kaliapparat is a laboratory device invented in 1831 by Justus von Liebig (1803–1873) for the analysis of carbon in organic compounds. The device, made of glass, consists of a series of five bulbs connected and arranged in a triangular shape. To determine the carbon in an organic compound with a kaliapparat, the substance is first burned, converting any carbon present into carbon dioxide (CO2). The gaseous products along with the water vapor produced by combustion are passed through the kaliapparat, which is filled with a potassium hydroxide (KOH) solution. The potassium hydroxide reacts with the CO2 to trap it as potassium carbonate. The global reaction, ignoring intermediate steps and the corresponding ionic dissociation, can be written as follows: :2 KOH + CO2 → K2CO3 + H2O. Subtracting the mass of the kaliapparat before the combustion from that measured after the combustion gives the amount of CO2 absorbed. From the mass of CO2 thus determined, standard stoichiometric ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Justus Von Liebig
Justus Freiherr von Liebig (12 May 1803 – 20 April 1873) was a German scientist who made major contributions to agricultural and biological chemistry, and is considered one of the principal founders of organic chemistry. As a professor at the University of Giessen, he devised the modern laboratory-oriented teaching method, and for such innovations, he is regarded as one of the greatest chemistry teachers of all time. He has been described as the "father of the fertilizer industry" for his emphasis on nitrogen and trace minerals as essential plant nutrients, and his formulation of the law of the minimum, which described how plant growth relied on the scarcest nutrient resource, rather than the total amount of resources available. He also developed a manufacturing process for beef extracts, and with his consent a company, called Liebig Extract of Meat Company, was founded to exploit the concept; it later introduced the Oxo brand beef bouillon cube. He popularized an earlier ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
1831 In Science
The year 1831 in science and technology involved some significant events, listed below. Astronomy * January 7 – Great Comet of 1831 (C/1831 A1, 1830 II) first observed by John Herapath. * March 7 – Royal Astronomical Society receives its Royal Charter. * Heinrich Schwabe makes the first detailed drawing of the Great Red Spot on Jupiter. * Mary Somerville translates Laplace's ''Mécanique céleste'' as ''The Mechanism of the Heavens''. Biology * September 1 – Zoological Gardens, Dublin, open in Ireland. * Robert Brown found the cell nucleus. Chemistry * A. A. Bussy publishes his ''Mémoire sur le Radical métallique de la Magnésie '' describing his method of isolating magnesium. * The Kaliapparat is a laboratory device invented in 1831 by Justus von Liebig. Exploration * June 1 – British Royal Navy officer James Clark Ross locates the position of the North Magnetic Pole on the Boothia Peninsula. * December 27 – Charles Darwin starts his voyage on from Plymouth. M ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
German Inventions
German inventions and discoveries are ideas, objects, processes or techniques invented, innovated or discovered, partially or entirely, in Germany or abroad by a person from Germany (that is, someone born in Germany – including to non-German parents – or born abroad with at least one German parent and who had the majority of their education or career in Germany). Often, things Discovery (observation), discovered for the first time are also called inventions and in many cases, there is no clear line between the two. Germany has been the home of many List of German inventors and discoverers, famous inventors, discoverers and engineers, including Carl von Linde, who developed the modern refrigerator; Paul Gottlieb Nipkow, Paul Nipkow and Karl Ferdinand Braun, who laid the foundation of the television with their Nipkow disk and cathode-ray tube (or Braun tube) respectively; Hans Geiger, the creator of the Geiger counter; and Konrad Zuse, who built the first fully automatic dig ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Analytical Chemistry
Analytical chemistry studies and uses instruments and methods to separate, identify, and quantify matter. In practice, separation, identification or quantification may constitute the entire analysis or be combined with another method. Separation isolates analytes. Qualitative analysis identifies analytes, while quantitative analysis determines the numerical amount or concentration. Analytical chemistry consists of classical, wet chemical methods and modern, instrumental methods. Classical qualitative methods use separations such as precipitation, extraction, and distillation. Identification may be based on differences in color, odor, melting point, boiling point, solubility, radioactivity or reactivity. Classical quantitative analysis uses mass or volume changes to quantify amount. Instrumental methods may be used to separate samples using chromatography, electrophoresis or field flow fractionation. Then qualitative and quantitative analysis can be performed, often with t ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
1831 In Germany
Events from the year 1831 in Germany Incumbents * Kingdom of Prussia ** Monarch – Frederick William III of Prussia (16 November 1797 – 7 June 1840) * Kingdom of Bavaria ** Monarch - Ludwig I, King of Bavaria, Ludwig I (1825–1848) * Kingdom of Saxony ** Anthony of Saxony, Anthony (5 May 1827 – 6 June 1836) * Kingdom of Hanover ** William IV (26 June 1830 to 1837) * Kingdom of Württemberg ** William I of Württemberg, William (1816–1864) Events *2 May - The Polytechnic Institute, today's Leibniz University Hanover established. Founded on 2 May 1831, it is one of the largest and oldest science and technology universities in Germany. Births * 7 January – Heinrich von Stephan, German postal union organizer (d. 1897) * 26 January – Heinrich Anton de Bary, German botanist, mycologist (d. 1888) * 24 February – Leo von Caprivi, Chancellor of Germany (German Reich), Chancellor of Germany (d. 1899) * 8 September – Wilhelm Raabe, German novelist (d. 1910) * 18 Septem ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Total Organic Carbon
Total organic carbon (TOC) is the amount of carbon found in an organic compound and is often used as a non-specific indicator of water quality or cleanliness of pharmaceutical manufacturing equipment. TOC may also refer to the amount of organic carbon in soil, or in a geological formation, particularly the source rock for a petroleum play; 2% is a rough minimum. For marine surface sediments average TOC content is 0.5% in the deep ocean, and 2% along the eastern margins. A typical analysis for total carbon (TC) measures both the total organic carbon (TOC) present and the complementing total inorganic carbon (TIC), the latter representing the amount of non-organic carbon, like carbon in carbonate minerals. Subtracting the inorganic carbon from the total carbon yields TOC. Another common variant of TOC analysis involves removing the TIC portion first and then measuring the leftover carbon. This method involves purging an acidified sample with carbon-free air or nitrogen prior to mea ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Elemental Analysis
Elemental analysis is a process where a sample of some material (e.g., soil, waste or drinking water, bodily fluids, minerals, chemical compounds) is analyzed for its elemental and sometimes isotopic composition. Elemental analysis can be qualitative (determining what elements are present), and it can be quantitative (determining how much of each is present). Elemental analysis falls within the ambit of analytical chemistry, the instruments involved in deciphering the chemical nature of our world. History Antoine Lavoisier is regarded as the inventor of elemental analysis as a quantitative, experimental tool to assess the chemical composition of a compound. At the time, elemental analysis was based on the gravimetric determination of specific absorbent materials before and after selective adsorption of the combustion gases. Today fully automated systems based on thermal conductivity or infrared spectroscopy detection of the combustion gases, or other spectroscopic methods are us ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Dumas Method Of Molecular Weight Determination
The Dumas method of molecular weight determination was historically a procedure used to determine the molecular weight of an unknown substance. The Dumas method is appropriate to determine the molecular weights of volatile organic substances that are liquids at room temperature. The method was designed by the French chemist Jean Baptiste André Dumas, after whom the procedure is now named. Dumas used the method to determine the vapour densities of elements ( mercury, phosphorus, sulfur) and inorganic compounds. Today, modern methods such as mass spectrometry and elemental analysis are used to determine the molecular weight of a substance. Determination The procedure entailed placing a small quantity of the unknown substance into a tared vessel of known volume. The vessel is then heated in a boiling water bath; all the air within the flask would be expelled, replaced by the vapor of the unknown substance. When no remaining liquid can be observed, the vessel may be sealed (e.g ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Combustion Analysis
Combustion analysis is a method used in both organic chemistry and analytical chemistry to determine the elemental composition (more precisely empirical formula) of a pure organic compound by combusting the sample under conditions where the resulting combustion products can be quantitatively analyzed. Once the number of moles of each combustion product has been determined the empirical formula or a partial empirical formula of the original compound can be calculated. Applications for combustion analysis involve only the elements of carbon (C), hydrogen (H), nitrogen (N), and sulfur (S) as combustion of materials containing them convert these elements to their oxidized form (CO2, H2O, NO or NO2, and SO2) under high temperature high oxygen conditions. Notable interests for these elements involve measuring total nitrogen in food or feed to determine protein percentage, measuring sulfur in petroleum products, or measuring total organic carbon (TOC) in water. History The method was ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
CHN Analyzer
Combustion analysis is a method used in both organic chemistry and analytical chemistry to determine the elemental composition (more precisely empirical formula) of a pure organic compound by combusting the sample under conditions where the resulting combustion products can be quantitatively analyzed. Once the number of moles of each combustion product has been determined the empirical formula or a partial empirical formula of the original compound can be calculated. Applications for combustion analysis involve only the elements of carbon (C), hydrogen (H), nitrogen (N), and sulfur (S) as combustion of materials containing them convert these elements to their oxidized form (CO2, H2O, NO or NO2, and SO2) under high temperature high oxygen conditions. Notable interests for these elements involve measuring total nitrogen in food or feed to determine protein percentage, measuring sulfur in petroleum products, or measuring total organic carbon (TOC) in water. History The method was ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Tiffany & Co
Tiffany & Co. (colloquially known as Tiffany's) is a high-end luxury jewelry and specialty retailer, headquartered on Fifth Avenue in Manhattan. It sells jewelry, sterling silver, porcelain, crystal, stationery, fragrances, water bottles, watches, personal accessories, and leather goods. Tiffany is known for its luxury goods, particularly its diamond and sterling silver jewelry. These goods are sold at Tiffany stores, online, and corporate merchandising. Its name and branding are licensed to Coty for fragrances and to Luxottica for eyewear. Tiffany & Co. was founded in 1837 by the jeweler Charles Lewis Tiffany and became famous in the early 20th century under the artistic direction of his son Louis Comfort Tiffany. In 2018 net sales totaled US$4.44 billion. In 2019 Tiffany operated 326 stores globally in countries such as the United States, Japan, and Canada, as well as Europe, the Latin America and Pacific Asia regions. On January 7, 2021, French multinational LVMH Moà ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
