Ammonium thiocyanate

Of ammonium thiocyanate

Colorless, hygroscopic, monoclinic plates or leaflets

Fixed

1.3 g · cm -3 ( 20 ° C)

149 ° C

Decomposition: 170 ° C

<1 hPa ( 20 ° C)

Very well in water (1600 g · l-1 at 20 ° C)

Attention

500 mg · kg -1 ( LD50, rat, oral)

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Ammonium thiocyanate (obsolete: ammonium thiocyanate ) is the ammonium salt of Thiocyanwasserstoffsäure (obsolete: hydrogen thiocyanate acid, HSCN ) with the formula NH4SCN.

Properties

Ammonium thiocyanate is colorless and odorless, hygroscopic, readily soluble in water and ethanol crystals with a density of 1.3 g/cm3.

Production

Ammonium thiocyanate may be prepared under pressure and elevated temperature of carbon disulfide and ammonia:

Use

It is used as a stabilizer for photographic developers, as a vulcanization accelerator, an accelerator for mortar and concrete, and herbicides.

In analytical chemistry, it serves as the detection of iron ( III) ions. The very intense red color in aqueous solution is due to the presence of undissociated [ Fe ( SCN ) 3 ( H2O ) 3] in addition to the ion [ Fe ( SCN ) 2 ( H2O ) 4] and [ Fe ( SCN ) ( H2O) 5 ] 2 due.

Properties

It is deposited at a temperature of from 70 ° C partially in thiourea, analogous to Wöhler 's synthesis of urea from ammonium cyanate. By concentrating an aqueous solution, thiourea can win.