110

Unit 1
Elements of Chemical Structure and Inorganic Nomenclature

1 -10. NAMING SALTS

A salt is an ionic compound containing some cation other than hydrogen and some anion other than hydroxide and oxide. Since the compound must be electrically neutral, the total positive valence (from all of the cations) must equal the total negative valence (from all the anions). This gives us a method for determining the valence of any particular ion in the formula. The names for salts are made by writing the name of the cation followed by the name of the anion. For example, CaCl2 has calcium as the cation and chloride as the anion, so the compound is called calcium chloride. FeSO4 has sulfate as the anion, but we need to know whether the ion is ferrous ion or ferric ion. This is easy for us to do: since we know the total negative valence (from sulfate) is -2, the total positive valence (for iron) must be +2; therefore, it is ferrous ion. The compound is ferrous sulfate.

Examples

  • KBr is potassium bromide
  • Mg(NO3)2 is magnesium nitrate
  • BaSO4 is barium sulfate
  • BiOCl is bismuth oxychloride
  • HgCl2 is mercuric chloride (mercury (II) chloride)
  • CuSO4 is cupric sulfate (copper (II) sulfate)
  • Al(OH)2Cl is aluminum dihydroxychloride
  • NaHCO3 is sodium bicarbonate (sodium hydrogen carbonate)
  • PbSO4 is plumbous sulfate (lead (II) sulfate)
  • KBrO3 is potassium bromate