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.
References in periodicals archive ?
Double- blind randomized placebo-controlled trial of the use of topical 10% potassium hydroxide solution in the treatment of molluscum contagiosum.
The membrane electrolysis facility in Ibbenburen is to have a nominal annual capacity of approximately 130,000 metric tons of potassium hydroxide solution - and a nominal annual capacity of approximately 82,000 metric tons of chlorine.
Negative results on potassium hydroxide (KOH) preparation and on fungal culture, as well as an almost completely normal appearance of the nail
This result showed that the percent yield of biodiesel with potassium hydroxide was greater as compared to others that were 93% of mutton oil and 91% of beef oil.
Mr Storey said the potassium hydroxide was a highly-corrosive substance and the equivalent of two teaspoon measures was a fatal dose.
It was known that the addition of caustic potash (potassium hydroxide) to boiler feedwater would reduce the corrosion to a minimum when the pH (a measure of the acidity of the water) was increased from 7 (neutral) to 10 (alkaline).
He said it appeared that a computer-controlled chemical pump malfunctioned and let out too much potassium hydroxide. He said the pump was immediately taken offline, and will be inspected today.
Potassium hydroxide and patch test results are negative.
Microbiologic examination on a 10% potassium hydroxide mount identified epithelial cells invaded by broad aseptate hyphae.
As he got older, he turned the basement of the family home into a laboratory, packed with physics textbooks and bottles labelled "potassium hydroxide" and "methanol".
Our labs use methanol, toluene, and potassium hydroxide. Some laboratories have nitric acid for cleaning generators or Aquatest 2010.
The water was spiked to 3, 4, 5, 6, 7, 8, 9, 10 pH levels utilizing sodium hydroxide and repeated using potassium hydroxide. Then it was added to the same green sand mixture.

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