Potassium Hydroxide

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Potassium hydroxide is an inorganic compound with the formula KOH, and is commonly called caustic potash.

Along with sodium hydroxide(NaOH), this colorless solid is a prototypical strong base. It has many industrial and niche applications, most of which exploit its corrosive nature and its reactivity toward acids. An estimated 700,000 to 800,000 tonneswere produced in 2005. About 100 times more NaOH than KOH is produced annually.[10] KOH is noteworthy as the precursor to most soft and liquid soaps, as well as numerous potassium-containing chemicals.

Molar mass 56.11 g mol−1
Appearance white solid, deliquescent
Odor odorless
Density 2.044 g/cm3 (20 °C)[1]
2.12 g/cm3 (25 °C)[2]
Melting point 360[3] °C (680 °F; 633 K)
Boiling point 1,327 °C (2,421 °F; 1,600 K)
85 g/100 g (-23.2 °C)
97 g/100 mL (0 °C)
121 g/100 mL (25 °C)
138.3 g/100 mL (50 °C)
162.9 g/100 mL (100 °C)[1][4]
Solubility soluble in alcohol, glycerol
insoluble in ether, liquid ammonia
Solubility in methanol 55 g/100 g (28 °C)[2]
Solubility in isopropanol ~14 g / 100 g (28 °C)
Basicity (pKb) −0.7[5](KOH(aq) = K+ + OH)
−22.0·10−6 cm3/mol
1.409 (20 °C)