NaCN - SODIUM CYANIDE

Properties of sodium cyanide:

White, thermally stable, melts and boils without decomposition. It is readily soluble in water (strong hydrolysis on the anion). At storage of the concentrated solution slowly decays. It absorbs CO2 from the humid air. It is decomposes by acids. Attaches oxygen, sulfur. Reducing agent. Participates in reactions of an exchange and complex formation.


Molar mass g/mol 49.01
Density g/cm3 1.596
Melting point °C 563.7
Boiling point °C 1497

Methods for preparation of sodium cyanide:

NaOH(conc.) + HCN = NaCN + H2O.

Na2CO3 + C(coke) + CaCN2 = 2NaCN + CaCO3 (600-700° C).

HCN + NaOH(conc.) = NaCN + H2O.


Chemical reactions with sodium cyanide:

NaCN • 2H2O = NaCN + 2H2O (normal temp., vacuum, over P4O10).

NaCN(diluted) + 4H2O(cold) = [Na(H2O)4](+) + CN(-) (pH > 7).

NaCN(conc.) + 2H2O = Na(HCOO) + NH3↑ (boiling).

NaCN(solid) + HCl(conc., cold) = NaCl + HCN↑.

2NaCN + H2SO4(conc. 30%) = 2HCN↑ + Na2SO4 (30-40° C).

2NaCN + H2O + CO2 = Na2CO3 + 2HCN (normal temp.).

2NaCN(diluted, hot) + O2 = 2NaOCN (catalyst Ni).

NaCN(diluted) + S = NaNCS (boiling).

NaCN + Na2S4O6 + H2O = NaNCS + Na2SO3S + H2SO4.

NaCN + H2O2(conc. 30%) = NaOCN + H2O.

NaCN + PbO2 = NaOCN + PbO (250° C).

2NaCN + H2O + 5NaClO = 2NaHCO3 + 2NaCl + N2↑.

NaCN(diluted) + AgNO3 = AgCN↓ + NaNO3,

NaCN(conc.) + AgCN(solid) = Na[Ag(CN)2](solution).


 

Did you know?

There are 4 basic reactions: single replacement, double replacement, synthesis and decomposition.