硫氰酸(化學式:HSCN)是硫氰的氫酸,與異硫氰酸(HNCS)互為異構體。硫氰酸可由硫氰酸鋇和硫酸反應製得:
- Ba(SCN)2 + H2SO4 → BaSO4↓ + 2 HSCN
硫氰酸是無色的、極易揮發的液體,在常溫下迅速分解。它在-90°C左右或5%的稀溶液中是穩定的。它易溶於水,水溶液為中強酸,在20℃時pKa=1.1[1] 。它的鹽(硫氰酸鹽)很容易製得,也很穩定。
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