Topics 8/9 - Acids and Alkalis/Reactions of Acids
Topic 8 (General)
Non-metal elements can react with oxygen to form compounds called non-metal oxides.
Non-metal oxides whih dissolve in water produce acidic solutions.
Alkaline solutions are made when soluble metal oxides or metal hydroxides dissolve in water.
The pH Scale
Acids have a pH of less than 7.
Alkalis have a pH of more than 7.
Neutral solutions (eg water) have a pH of 7.
A substance with a pH higher than 7 (alkali) which has a high concentration of hydroxyl ions. Bases react with acids to form a salt + water. This process is called neutralisation. Metal hydroxides, carbonates and oxides are all bases.
The ions present in acidic and alkaline solutions (credit)
- In water and in neutral solutions the concentration of H+(aq) and OH-(aq) is the same. This is why water is neutral.
- An acidic…