2. Acids
Substances which have ph less than 7.
Substances which have sour taste.
There are three common acids and alkalis used in
laboratory.
Acids:
Hydrochloric acid
•Sulphuric acid
•Nitric acid
Alkalis: sodium hydroxide, potassium
hydroxide, ammonia
3. Indicators
A scale which changes color depending on the
type of solutions.
There are two types of indicator:
• Universal indicator
• Lime indicator
5. Neutralization
When acid reacts with base and they cancel out
together is called neutralization.
The common neutralization examples which are
common in our daily life are:
• Too much acid in stomach causes indigestion.
• Lime is spread on the soil to neutralize acid.
• Alkali like baking soda is used to neutralize a bee
Sting.
• Acid like vinegar is used to neutralize a wasp
sting.
