Structure
In aqueous solution, KCN is dissociated into hydrated K+ ions and CN−. As a solid, the salt crystallizes such that the cations and anions organize like Na+ and Cl− in NaCl. The cations and anions six-coordinate. Each K+ is linked to two pi-bonds of the CN− as well as two links each to C and N each. Since CN− is diatomic, the symmetry of the solid is lower than that in NaCl. The cyanide anions form sheets. The CN− ions rapidly rotate in the solid at ambient temperature such that the time averaged shape of the CN− ions is spherical.
Read more about this topic: Potassium Cyanide
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