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Potassium Hydroxide Flakes
At higher temperatures, solid KOH crystallizes in the NaCl motif. The OH group is either rapidly or randomly disordered so that the OH- group is effectively a spherical anion of radius 1.53 Å (between Cl- and F- in size). 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. KOH forms a series of crystalline hydrates, namely the monohydrate KOH·H2O, the dihydrate KOH·2H2O, and the tetrahydrate KOH·4H2O.[4]
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