FORMULA WRITING AND NOMENCLATURE OF CUATERNARY COMPOUNDS

I. HYDROGEN-CONTAINING SALTS FROM OXIACIDS

If a salt is formed from an acid that contained two or more acid hydrogen atoms without replacing all of the hydrogens, then a hydrogen salt is formed. Such salts contain the word hydrogen, or the prefix bi-, in the middle of the salt names. (The use of hydrogen is currently preferred.). Example:

CuHCO3 copper(I) hydrigencarbonate or copper(I) bicarbonate

NaHSO4 sodium hydrogensulfate or sodium bisulfate

When the acid that formed the salt has more than two hydrogens is necessary to use prefixes before “hydrogen”. Example:

NaH2BO4 sodium dihydrigenborate

Na2HBO4 sodium monohydrogenborate

II. AMMONIUM COMPOUNDS

The molecular ion ammonium NH4+ forms salts as a metal do. Formula writing for this type of compounds is easily if we take in account that the group NH4+ oxidation number is +1 (like an alkali metal). Examples:

NH4 Cl O3 ammonium chlorate

NH4 HSO4 ammonium hydrogensulfate

(NH4 )2CO3 ammonium carbonate