Sulphide (Chemical Formula S2-) is sulphur’s inorganic anion. Sulphide salts have no color contributions from sulphides. The animal or human skin could turn corrosive or would attack the skin and examples include sodium sulphide (Na2S) and even being classified as a strong base.  Also, the sulphur anion which is the simplest is none other than sulphide.  The bonding nature involved is not taken into account by the IUPAC nomenclature that is compositional.

For instance, there are no sulfide ions contained titanium sulfide and selenium disulfide. Sulphur in some form of a compound is incorporated like dimethyl sulfide by releasing hydrogen sulphide  once acidified  and hence there are uses of sulphides in a non systematic manner.

Regarding the chemical properties of sulphides, they could not be detected at pH < ~15 (8 M NaOH) and they are not present in highly alkaline water at agreeable concentrations.

Chemical Reaction of Sulphide

Once the sulfide is treated with a standard acid, it is converted into hydrogen sulphide (H2S) along with salt of a metal.  Sulphur or Sulphate is formed once supplied is oxidized. Sulphur metals or salts of metals are formed once non metals like bromine, iodine, and chlorine react with metal sulphides viz.

8 MgS + 8 I2 ? S8 + 8 MgI2

Also using a relevant oxidizer and sulphide, once could prepare Sulphur viz.

16 HNO3 + 24 H2S ? 16 NO + 3 S8 + 32 H2O

Derivatives of Metal

Solid sulphides get precipitated once sulphide sources(NaHS, Na2S, and H2S) react with transition metal cat ions in the aqueous solutions form. Inorganic sulphides have relatively low water solubility.  One such instance is the cadmium yellow (CdS). Ag2S, on the other hand, is the black coloured stain that is found in sterling silver. Salts is the other name that it is given for these stains

Sulphides are referred to as the linkage C-S-C and a majority of sulphides are insoluble in water and are mostly non toxic in nature. Only if in case there is an exposure to mineral acids that are strong that includes gastric acids, certain metal sulphides would produce hydrogen sulphide that is toxic in nature. Also, the sulphides that are organic are highly flammable. Sulphur dioxide gas is produced when sulphide is burnt.

From the above discussion, it is evident that sulphides are used for various purposes and would be used extensively by chemists and scientists in the coming years.

Practise This Question

Figure below shows a flat car of mass 'M' on a frictionless road. A small massless wedge is fitted on it as shown. A small ball of mass 'm' is released from the top of the wedge, it slides over it and falls in the hole at distance 'l' from the initial position of the ball. Find the distance the flat car moves till the ball gets into the hole.