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Can sodium thiocyanate be synthesised by combining equimolar amounts of ammonia, sodium hydrosulfide and carbon dioxide in the presence of phosphorous pentoxide by the following reaction: NH3 + NaSH + CO2 -> NaSCN + 2H2O ?

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It has been observed spectroscopically but has not been isolated as a pure substance.

Thiocyanic_acid

Regarding the sodium salt, creating it in concentrated sulphuric acid cannot be considered seriously.

$\ce{P4O10}$ would not be much better, forming various forms of condensated phosphoric acid.

Furthermore, carbon dioxide manifests weak oxidative properties at very high temperatures only.

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  • $\begingroup$ I see. Edited question. $\endgroup$ Jan 11 '20 at 4:33

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