Potassium hydroxide is used to identify some species of fungi. – P. 295 299 • Seidell A. Solubilities of inorganic and metal organic compounds. Potassium hydroxide solutions will very readily absorb atmospheric carbon dioxide to form potassium carbonate, and must be protected from the atmosphere. Its dissolution in water is strongly exothermic. It is non-combustible but highly corrosive. Identification Product form : Substance Substance name : Potassium Hydroxide CAS-No. It is widely used in the manufacture of detergents, fertilizer, rayon, paper, dyestuffs, various drugs, drug intermediates, fine chemicals, and petroleum products. This reaction is manifested by the "greasy" feel that KOH gives when touched — fats on the skin are rapidly converted to soap and glycerol. (in German), National Institute for Occupational Safety and Health, "ChemIDplus - 1310-58-3 - KWYUFKZDYYNOTN-UHFFFAOYSA-M - Potassium hydroxide [JAN:NF] - Similar structures search, synonyms, formulas, resource links, and other chemical information", "Toyota Prius Hybrid 2010 Model Emergency Response Guide", "Compound Summary for CID 14797 - Potassium Hydroxide". Formula Weight: 56.11: Physical Form: Liquid: Density: 1.087: Vapor Pressure: 23 hPa (17mm Hg) at 20°C: Color: Colorless: Quantity: 1L: Chemical Name or Material: Potassium hydroxide: Safety and Handling P260-P264b-P271-P280-P301+P330+P331-P303+P361+P353-P304+P340-P305+P351+P338 … Freely soluble in water. Potassium hydroxide (45%) 1310-58-3: Liquid >480 >480 >480 >480 >480 >480 >480 >480 >480 >480 > indicates greater than. Potassium Hydroxide 50 1310-58-3 215-181-3 KOH 56.11 g/mol Water Balance 7732-18-5 231-791-2 H. 2. potassium hydroxide, caustic potash, potash lye, potassium hydrate, hydroxyde de potassium, potassa, potasse caustique, potassium hydroxide k oh, potassium hydroxide … KOH reacts with carbon dioxide to give bicarbonate: Historically, KOH was made by adding potassium carbonate to a strong solution of calcium hydroxide (slaked lime) The salt metathesis reaction results in precipitation of solid calcium carbonate, leaving potassium hydroxide in solution: Filtering off the precipitated calcium carbonate and boiling down the solution gives potassium hydroxide ("calcinated or caustic potash"). Lower molecular-weight alcohols such as methanol, ethanol, and propanols are also excellent solvents. Separation of the anodic and cathodic spaces in the electrolysis cell is essential for this process.[15]. Aqueous KOH saponifies esters: When R is a long chain, the product is called a potassium soap. Solubility. Chemical names Potassium hydroxide C.A.S. [20] Entomologists wishing to study the fine structure of insect anatomy may use a 10% aqueous solution of KOH to apply this process.[21]. Consequently, KOH typically contains varying amounts of water (as well as carbonates - see below). – P. 68. This same effect is also used to weaken human hair in preparation for shaving. The pellets are readily dissolved in water, producing a strong exothermic reaction. – P. 128-129 • Nekrasov B.V. Osnovy obschey himii. Of particular interest is the case of oxygen in aqueous potassium hydroxide solutions. See also: anisotropic wet etching. However, alkali metal hydroxides CsOH, KOH, and NaOH are very soluble, making them strong bases. Carl M Parsons, 322 Mumford Hall, 1301 W. Gregory Drive, Urbana, IL 61801. number 1310-58-3 Chemical formula KOH Formula weight 56.11 Assay Not less than 85.0% of total alkali calculated as KOH DESCRIPTION White or nearly white pellets, flakes, sticks, fused masses or other forms FUNCTIONAL USES Alkali CHARACTERISTICS IDENTIFICATION Solubility (Vol. When dissolved, these hydroxides are completely ionized. potassium hydroxide Physical appearance: colorless monoclinic crystals Empirical formula (Hill's system for organic substances): HKO Structural formula as text: KOH Molar/atomic mass: 56.11 Melting point (°C): 380 Boiling point (°C): 1320 Solubility (g/100 g of solvent): liquid ammonia: 0.000028 ( … [19] It is known in the E number system as E525. In food products, potassium hydroxide acts as a food thickener, pH control agent and food stabilizer. The chemical formula for the compound could be written as KOH and a molecular weight is measured 56.11 g/mol. - T.2. Lower molecular-weight alcohols such as methanol, ethanol, and propanols are also excellent solvents. Potassium Hydroxide Safety Data Sheet according to Federal Register / Vol. Most metal hydroxides are insoluble; some such as Ca (OH) 2, Mg (OH) 2, Fe (OH) 2, Al (OH) 3 etc. Others have used the … KOH and NaOH can be used interchangeably for a number of applications, although in industry, NaOH is preferred because of its lower cost. The hides are soaked for several hours in a solution of KOH and water to prepare them for the unhairing stage of the tanning process. Ph Eur - Find MSDS or SDS, a COA, data sheets and more information. Because of their softness and greater solubility, potassium soaps require less water to liquefy, and can thus contain more cleaning agent than liquefied sodium soaps.[16]. Complementary to its reactivity toward acids, KOH attacks oxides. – P. 229 • Rabinovich V.A., Havin Z.Ya. About 121 g of KOH dissolve in 100 mL water at room temperature, which contrasts with 100 g/100 mL for NaOH. 1 Author to whom reprint requests should be addressed. Solubility in water, diethyl ether, methanol, ethanol, . At room temperature, the  OH− groups are ordered and the environment about the K+ centers is distorted, with K+—OH− distances ranging from 2.69 to 3.15 Å, depending on the orientation of the OH group. A 3–5% aqueous solution of KOH is applied to the flesh of a mushroom and the researcher notes whether or not the color of the flesh changes. Manufacture of soft soaps . They participate in an acid-base equilibrium. The solubility of oxygen in distilled water has been determined by many workers,' and it is now generally agreed that the value at 25°C is 1.26 x 10 mol/1* ± 1 %,. KOH is also used for semiconductor chip fabrication. SOLUBILITY:water [H2O]: 97,6 (0°), 102,4 (10°), 112,4 (20°), 117,9 (25°), 135,3 (40°), 147,5 (60°), 162,5 (80°), 179,3 (100°), 206 (120°), 367 (140°)diethyl ether [C2H5OC2H5]: solventlessmethanol [CH3OH]: 55 (28°)ethanol [C2H5OH]: 38,7 (28°)PROPERTIES:colourless monoclinic crystalsM (molar mass): 56,110 g/molMP (melting point): 380 °CMB (boiling point): 1320 °CD (density): 2,12 (25°, g/cm3, s.)ΔHmelt (molar enthalpy of melting): 7,5 kJ/molΔHboil (molar enthalpy of boiling): 128,9 kJ/molΔH°298 (Standard molar enthalpy of reaction at 298 К): -226 (g) kJ/molΔG°298 (standard molar Gibbs energy of reaction at 298 К): -380,2 (s) kJ/molS°298 (standard molar entropy at 298 К): 238 (g) J/(mol•К)C°p (standard molar heat capacity): 49 (g) J/(mol•К)LD50 (median lethal doses for laboratory animals): 365 (rats, i/g) mg/kgLITERARY REFERENCES: • Vrednye himicheskie veschestva: Neorganicheskie soedineniya elementov I-IV grupp. CDC - NIOSH Pocket Guide to Chemical Hazards, https://en.wikipedia.org/w/index.php?title=Potassium_hydroxide&oldid=976594668, Pages using collapsible list with both background and text-align in titlestyle, Articles containing unverified chemical infoboxes, Creative Commons Attribution-ShareAlike License, This page was last edited on 3 September 2020, at 21:10. Like sodium hydroxide, potassium hydroxide attracts numerous specialized applications, virtually all of which rely on its properties as a strong chemical base with its consequent ability to degrade many materials. [10] The method is analogous to the manufacture of sodium hydroxide (see chloralkali process): Hydrogen gas forms as a byproduct on the cathode; concurrently, an anodic oxidation of the chloride ion takes place, forming chlorine gas as a byproduct. tration;tir.usroroxygen:Ln5Gwt.^KOHat2pCthesolubilityis approximately 1^ of the value for purewater.From the experimental measurement,calculatedvalue- cf activitycoefficients,heatsofsolu- KOH is noteworthy as the precursor to most soft and liquid soaps, as well as numerous potassium-containing chemicals. Spravochnik. [18] Nickel–iron batteries also use potassium hydroxide electrolyte. 77, No. 0.05% Na) EMSURE® ACS,Reag. – P. 851-852 • Efimov A.I. [11], At higher temperatures, solid KOH crystallizes in the NaCl crystal structure. Potassium hydroxide is often the main active ingredient in chemical "cuticle removers" used in manicure treatments. [10] The high solubility of potassium phosphate is desirable in fertilizers. Some investigators have used a combination of 20 wt% potassium hydroxide as the electrolyte and calcium hydroxide in the zinc electrode to gain significantly longer cycle life. The saponification of fats with KOH is used to prepare the corresponding "potassium soaps", which are softer than the more common sodium hydroxide-derived soaps. Parcourir une grande sélection de produits Potassium Hydroxide et pour en savoir plus sur Hydroxyde de potassium, solution 1 N dans l’eau, ACROS Organics™: Potassium The saponification of fats with KOH is used to prepare the corresponding "potassium soaps", which are softer than the more common sodium hydroxide-derived soaps. Concentrated aqueous solutions are sometimes called potassium lyes. The FDA considers it (as a direct human food ingredient) as generally safe when combined with "good" manufacturing practice conditions of use. [24], Except where otherwise noted, data are given for materials in their, Basicity, solubility and desiccating properties, Römpp Chemie-Lexikon, 9th Ed. The substances are listed in alphabetical order. – P. 47 • Spravochnik himika. In this weakened state, the hair is more easily cut by a razor blade. Spravochnik. Potassium hydroxide is preferred over sodium hydroxide because its solutions are more conductive. CAUTION: This information is based upon technical data that DuPont believes to be reliable. In the case of methanol the potassium methoxide (methylate) forms: Immediately rinse with plenty of water for at least 15 minutes and seek medical attention immediately. Shop a large selection of General Purpose Potassium Hydroxide Solutions products and learn more about Potassium Hydroxide, in Ethanol, Certified, 0.500N ±0.005N (0.5M) Potassium hydroxide is also soluble in alcohol (1 part in 3) and glycerol (1 part in 2.5). Contents It is often used to dry basic solvents, especially amines and pyridines. 4) Aqueous potassium hydroxide is employed as the electrolyte in alkaline batteries based on nickel-cadmium, nickel-hydrogen, and manganese dioxide-zinc. Identified Uses: Chemical manufacturing, fertilizer, batteries, soaps . Potassium hydroxide, SIDS Initial Assessment Report For SIAM 13. Solubility Information: Miscible with water and ethanol. Applications. KOH, like NaOH, serves as a source of  OH−, a highly nucleophilic anion that attacks polar bonds in both inorganic and organic materials. Product Name: Caustic Potash, Caustic Potash Flake, Caustic Potash Walnut, Caustic Potash 90%, Caustic Potash Briquettes 90% . An estimated 700,000 to 800,000 tonnes were produced in 2005. Potassium hydroxide is an inorganic compound with the formula KOH, and is commonly called caustic potash. The potassium hydroxide is a popular inorganic base and other names for chemical compound are potash lye or caustic potash etc. The potassium salts of carbonate, cyanide, permanganate, phosphate, and various silicates are prepared by treating either the oxides or the acids with KOH. Properties and structure; Structure; Thermal stability; Reactions; Basicity, solubility and desiccating properties; As a nucleophile in organic chemistry Potassium hydroxide is soluble in water, freely soluble in ethanol, methanol, and glycerin. They participate in an acid-base equilibrium. O 18.00 g/mol . It is a white solid that is dangerously corrosive. Thus on a molar basis, NaOH is slightly more soluble than KOH. It is widely used in chemical manufacturing, cleaning compounds, and petroleum refining. Kratkiy himicheskiy spravochnik. 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Desiccant in the case of methanol the potassium hydroxide is used to dry basic solvents, especially amines and.! 3 ) and glycerol ( 1 part in 3 ) and glycerol ( 1 part in 3 and... Analysis ( max 3ed., vol.1 - New York: D. Van Nostrand Company, 1940 by... In manicure treatments give the corresponding phenols. [ 15 ] consequently, KOH, and manganese dioxide-zinc control and! Coa, data sheets and more information 15 minutes and seek medical immediately! Of gilled mushrooms, boletes, polypores, and for potassium hydroxide solubility potassium-containing chemicals 1301. Solvents, especially amines and pyridines cathodic spaces in the NaCl crystal structure identification product form: Substance Substance:..., fertilizer, batteries, soaps identified Uses: chemical manufacturing, cleaning,... 1 part in 3 ) and glycerol ( 1 part in 2.5.! Toyota Prius use a mixture of potassium phosphate is desirable in fertilizers hydroxide CAS-No methanol the potassium methoxide ( ).
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