The Language of Chemistry | |||||
Chemical Equations | Introduction to Acids, Bases & Salts | Chemical Nomenclature |
The Language of Chemistry - 04
Introduction to Acids, Bases & Salts
The hydrogen cation (H+) and the hydroxide (hydroxyl) anion (OH−) are two of the most important ions, since they are the basis for two very important classes of compounds in chemistry – acids and bases. While a hydrogen cation is simply a proton (since the hydrogen atom consists of a single proton and a single electron), a hydroxide anion is a polyatomic anion, in which one oxygen atom covalently bonds with one hydrogen atom.
Acids
Acids are compounds which contain hydrogen which is replaceable by a metal in a chemical reaction.
Some common acids are hydrochloric acid (HCl), nitric acid (HNO3), sulphuric acid (H2SO4), and phosphoric acid (H3PO4).
Hydracids (Binary Acids)
A binary acid, or hydracid, contains hydrogen and a non-metal, but not oxygen. An example is hydrochloric acid (), which is hydrogen chloride dissolved in water.
Oxoacids (Oxyacids)
An oxoacid, or oxyacid, in addition to hydrogen, contains an oxoanion, which is a polyatomic anion containing oxygen. Most acids are oxoacids. Some examples are nitric acid (HNO3) and sulphuric acid (H2SO4).
Bases
Bases or alkalis are compounds which provide hydroxide radicals and react with acids to form salts and water only.
Some common bases are sodium hydroxide (NaOH) or caustic soda, potassium hydroxide (KOH) or caustic potash, and barium hydroxide (Ba(OH)2).
Salts
A salt is a compound formed by the replacement of the hydrogen atom(s) of an acid by metal atom(s).
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Chemical Equations | Introduction to Acids, Bases & Salts | Chemical Nomenclature | |||
The Language of Chemistry |