KSCN + KHSO4 → HSCN + K2SO4
or
KNCS + KHSO4 → HNCS + K2SO4
Potassium thiocyanate react with potassium bisulfate to produce hydrogen thiocyanate and potassium sulfate. Potassium thiocyanate is wet. Potassium bisulfate - solid. The reaction slowly proceeds at room temperature, in vacuo.