NH4NCS - AMMONIUM THIOCYANATE

Properties of ammonium thiocyanate:

White, when heating isomerised in the thiourea. It is readily soluble in water with a strong endo-effect (hydrolysis on the cation). The concentrated solution on light is reddens. Doesn't form crystalline hydrates. It is decomposes by concentrated acids and alkalis. It reacts with typical oxidants. Participates in reactions of an exchange and complex formation.


Molar mass g/mol 76.12
Density g/cm3 1.305
Melting point °C 149

Methods for preparation of ammonium thiocyanate:

2(NH3-H2O) + CS2 = NH4NCS + H2S↑ + 2H2O (110° C).


Chemical reactions with ammonium thiocyanate:

NH4NCS = CS(NH2)2 (140-150° C).

NH4NCS(diluted, cold) = NH4(+) + NCS(-),

NH(+)4 + H2O = NH3 • H2O + H3O(+).

3NH4NCS(conc.) + 2H2O = time = H2C2N2S3 + 2(NH3 • H2O) + NH4CN.

NH4NCS + H2SO4(diluted) + H2O = CSO↑ + (NH4)2SO4 (30° C).

NH4NCS(conc.) + KOH(conc.) = KNCS + NH3↑ + H2O (boiling).

NH4NCS(solution) + I2 = 2NH4I + (SCN)2 (0° C).

2NH4NCS+2H2SO4(diluted)+MnO2 = (SCN)2+MnSO4+2H2O+(NH4)2SO4 (0° C).

NH4NCS + Pb(NO3)2 = Pb(NCS)2↓ + NH4NO3.

NH4NCS(diluted) + 5H2O + FeCl3 = [Fe(H2O)5(NCS)]Cl2 + NH4Cl,

6NH4NCS(conc.) + FeCl3 = (NH4)3[Fe(NCS)6] + 3NH4Cl.

NH4NCS + H3O(+)(cation exchanger) = HNCS + NH4(+)(cation exchanger) + H2O.


 

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