potassium hydroxide


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potassium hydroxide,

chemical compound with formula KOH. Pure potassium hydroxide forms white, deliquescent crystals. For commercial and laboratory use it is usually in the form of white pellets. A strong base, it dissolves readily in water, giving off much heat and forming a strongly alkaline, caustic solution (see acids and basesacids and bases,
two related classes of chemicals; the members of each class have a number of common properties when dissolved in a solvent, usually water. Properties
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). It is commonly called caustic potash. It closely resembles sodium hydroxide in its chemical properties and has similar uses, e.g., in making soap, in bleaching, and in manufacturing chemicals, but is less widely used because of its higher cost. It is prepared chiefly by electrolysis of potassium chloride; commercial grades of it sometimes contain the chloride as well as other impurities.

Potassium Hydroxide

 

caustic potash, KOH, a strong alkali; colorless crystals. Density, 2.12 g/cm3 (25°C); melting point, 380°C.

Potassium hydroxide is readily soluble in water (97 g per 100 g H2O at 0°C; 112 g at 20°C), liberating a considerable amount of heat. Potassium hydroxide is produced commercially in the form of an opaque solid white mass containing 90–92 percent KOH (representing a mixture of KOH and KOH·H2O). In the air, potassium hydroxide absorbs H2O and C02 and deliquesces, gradually converting to potassium carbonate K2C03. Potassium hydroxide has a destructive effect on skin, paper, wool, silk, and other organic materials; it causes severe burns on human skin and is particularly dangerous to the eyes. Safety goggles and rubber gloves must be worn when working with it. Potassium hydroxide is obtained by the electrolysis of calcium chloride solutions. Potassium hydroxide is used in the manufacture of liquid soaps, as a source material in the preparation of potassium salts, in alkaline batteries, and as a laboratory reagent.

potassium hydroxide

[pə′tas·ē·əm hī′dräk‚sīd]
(inorganic chemistry)
KOH Toxic, corrosive, water-soluble, white solid, melting at 360°C; used to make soap and matches, and as an analytical reagent and chemical intermediate. Also known as caustic potash; potassium hydrate.
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All production of chlorine, potassium hydroxide and caustic lye using mercury-based amalgam electrolysis has to stop by the end of 2017 due to legislative requirements.
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Evonik is already a European market leader for potassium hydroxide solutions and derivatives - as well as a globally leading provider of alkoxides, which also are manufactured by electrolysis in Lulsdorf.
We definitely don't want these batteries in a landfill," Thompson agrees, again partly because the corrosive potassium hydroxide poses serious risks.
c, Skin smear from infected frog, stained with 1:1 cotton blue and 10% aqueous potassium hydroxide (aq KOH) (D, developing stages of Batrachochytruim dendrobatidis; arrow, septum within a sporangium; bar, 10 pro).
The doctors told me that the potassium hydroxide in the fluid is so poisonous and corrosive it can kill people.
SC 2002 is a structural adhesive with resistance to cutting oil, motor oil, unleaded gasoline, and potassium hydroxide solutions.
Filled with potassium hydroxide electrolyte fluid, the cells are expected to function without water replenishment for up to two years.
The electrolyte is aqueous potassium hydroxide (KOH).
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Sub-officer David Johnson, of Binley Fire Station, said: "A package of potassium hydroxide, which is a corrosive alkali, had ruptured on the conveyor belt system.
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