potassium hydroxide

(redirected from KOH)
Also found in: Dictionary, Thesaurus, Medical, Acronyms, Wikipedia.

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
..... Click the link for more information.
). 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.
The Columbia Electronic Encyclopedia™ Copyright © 2013, Columbia University Press. Licensed from Columbia University Press. All rights reserved. www.cc.columbia.edu/cu/cup/
The following article is from The Great Soviet Encyclopedia (1979). It might be outdated or ideologically biased.

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.

The Great Soviet Encyclopedia, 3rd Edition (1970-1979). © 2010 The Gale Group, Inc. All rights reserved.

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.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
References in periodicals archive ?
Yentieng said Lay, who was an assistant to Koh Rong commune chief Hourleang, also mobilised villagers in an attempt to use violence against ACU officials.
The observed acid values for sesame oil based biodiesel were 0.50mg/g, 0.53mg/g and 0.56mg/g for NaOH and 0.55mg/g, 0.52mg/g, and 0.53mg/g for KOH under 0.5%, 1%, 1.5% concentration respectively (Table-4).
Conclusion: PAS staining of nail clippings for hyphae is a very sensitive method for diagnosis of onychomycosis as compared to KOH mount.
"As 5G will bring a bigger change than a paradigm shift from feature phone to smartphone, we are thoroughly preparing for it," Koh said.
Koh Klang, or Klang island, is a community of about 5,000 people, 90% of which are Muslims.
Effective at the end of the shareholders' meeting held on 15 March 2017, Koh replaces James G.
Atliekant tyrimus, Brauno duju generatorius (3) (2 pav.) uzpildomas elektrolito tirpalu atitinkamai 0,5%, 2%, 8%, 16% ir 36% KOH koncentracijos.
by Times News Service TIN Hotels will operate midscale 4-star hotels, said Clement Koh, the senior vice president for sales and marketing at Singapore's General Hotel Management.
As my airport transfer winds through Chaweng, Koh Samui's hectic main town, populated with a mass of biergartens and bistros, I'm beginning to wonder.
| The price includes three nights at the Silavadee Pool Spa Resort in Koh Samui; four nights at Santhiya Koh Phangan Resort and three nights at the Anantara BoPhut Resort and Spain Koh Samui, all on a B&B basis, plus airport transfers, internal flights with Bangkok Airways and return international flights from London Heathrow with EVA Air.