硫氰酸(化学式:HSCN)是硫氰的氢酸,与异硫氰酸(HNCS)互为异构体。硫氰酸可由硫氰酸钡和硫酸反应制得:
- Ba(SCN)2 + H2SO4 → BaSO4↓ + 2 HSCN
硫氰酸是无色的、极易挥发的液体,在常温下迅速分解。它在-90°C左右或5%的稀溶液中是稳定的。它易溶于水,水溶液为中强酸,在20℃时pKa=1.1[1] 。它的盐(硫氰酸盐)很容易制得,也很稳定。
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