The types and properties of the acides
Types of the compounds
There are countless number of existing compounds , they can be classified according to their properties only into the acides , the bases ( alkalis ) , the oxides and the salts .
The acides are the substances which dissociate in the water producing the positive hydrogen ions ( H+) , The lemon juice , the vinegar , the fizzy drinks and sour milk are considered from the natural acids .
The acids are classified according to their strength ( degree of ionization ) into the strong acids ( such as hydrochloric acid and nitric acid ) and the weak acids ( such as carbonic acid ) .
The acids are classified according to their stability ( the boiling point and the difficulty of its decomposition ) into the stable acids ( such as sulphuric acid ) and the unstable acids ( such as carbonic acid ) .
The properties of the acides
The acides have a sour taste , and they change the colour of the litmus paper into red due to the presence of the positive hydrogen ions ( H+) .
The chemical formula of all mineral acids begin with hydrogen joined with one of the negative atomic groups such as sulpheric acid and nitric acid .
The chemical formula of all mineral acids begins with hydrogen joined with one of negative nonmetal ions such as hydrochloric acid ( HCl ) and hydrobromic acid ( HBr ) .
The acids destroy the chemical properties of bases , they conduct an electric current and they produce hydrogen ion ( H+) in solution , The chemical reacting of the acids with an active metal , hydrogen gas (H2) is evolved .