Synonym(s): Dipotassium nickel(2+) tetracyanide Empirical Formula: C₄K₂N₄Ni -+ xH₂O Linear Formula: K₂Ni(CN)₄ -+ xH₂O Formula Weight: 240.96 (anhydrous basis) MDL Number: MFCD00150396 Density: 1.875 g/mL(lit.)