ACIDS & bases. 9 Sci – Term 4. What is an Acid?. Definition: An acid is a compound that contains hydrogen ions (H + ) H + Hydrogen Ion is essentially a proton Acid’s give protons (H + hydrogen ions). Characteristics of Acids. Acids are characterised by: Sour taste
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9 Sci – Term 4
Definition: An acid is a compound that contains hydrogen ions (H+)
Acids are characterised by:
If chemicals have properties of an acid, they are said to be acidic.
Definition: A base is a compound that contains a Hydroxide Ion (OH-).
Bases are characterised by:
Bases which are soluble in water are called Alkali’s.
A basic solution is referred to as being alkaline.
Litmus is made from lichen (fungus and algae/bacteria). It is a natural indicator which changes colour in the presence of acids and bases.