Things required :
- Plastic cup
- Small piece of lime stone
How it’s react ?
o Take a plastic cup. Take half cup of vinegar. ( vinegar is an acid )
o Place a small piece of lime stone in the cup of vinegar.
o Allow it to soak for several days.
o Remove the lime stone and observe carefully.
In nature when rain water combines with carbon dioxide in air or with carbon dioxide from decaying organic matter , carbonic acid is produced. When the acid flows through cracks in limestone, it chemically reacts with the rock forming dissolved calcium, which is carried away in water.