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Question: What is the ionic compound name for \( {K_2}S \) ?...

What is the ionic compound name for K2S{K_2}S ?

Explanation

Solution

Hint : Systematic name, most commonly known as IUPAC name are generally assigned to the compounds. IUPAC stands for International Union of Pure and Applied Chemistry. It is the world authority on the chemical nomenclature as well as terminology. In this question we have to tell the ionic compound name for K2S{K_2}S which is an inorganic compound and produced by heating K2SO4{K_2}S{O_4} in the presence of carbon (coke):
K2SO4+4 C→K2S+4CO{K_2}S{O_4} + 4{\text{ }}C \to {K_2}S + 4CO

Complete Step By Step Answer:
IUPAC provides consistency to the names of organic compounds. It enables every compound to possess a unique name, which otherwise is not plausible with the common names. The chemical structure for K2S{K_2}S is shown below:

As clear from its chemical formula and structure, K2S{K_2}S comprises two metal ions and a non-metal ion. We know that any compound containing a metal and a non-metal is considered to be an ionic compound. Now let us identify the name for the given compound i.e. K2S{K_2}S . K2S{K_2}S consists of SS as non-metals after the metal i.e. KK so we'll use the Periodic Table to identify their names. Rules to write the names of Ionic Compounds are listed below:

  1. Name the metal (i.e. cation) according to its appearance in the Periodic Table. For example: Na+=Sodium, Mg2+=Magnesium, Al3+=AluminumN{a^ + } = Sodium,{\text{ }}M{g^{2 + }} = Magnesium,{\text{ }}A{l^{3 + }} = Aluminum
    In the present case, KK stands for Potassium.
  2. Find the name of the non-metal (i.e. anion) according to its appearance in the Periodic Table and replace its ending with ‘ide’ when you name a compound.
    In the present case, SS stands for sulfur and it will be written as sulfide.
    Hence after combining the name of metal and non-metal, the name of K2S{K_2}S is Potassium sulfide.

Note :
If you are given the systematic name of an ionic compound and you are asked to find the chemical formula of that compound, take into account the charges of each of the elements present in the compound. Make sure that the charges are balanced such that net charge for the compound must be zero.