What do you mean by a precipitation reaction? Explain by giving examples.

Answer:

A precipitation reaction is a type of chemical reaction where two aqueous (liquid) solutions react to form an insoluble solid called a precipitate. This solid separates out from the solution.

Example 1:

Na₂SO₄(aq) + BaCl₂(aq) → BaSO₄(s)↓ + 2NaCl(aq)

• Here, Barium Sulphate (BaSO₄) is formed as a white precipitate.

• The downward arrow (↓) shows that a solid is formed and settles out.

Example 2:

AgNO₃(aq) + NaCl(aq) → AgCl(s)↓ + NaNO₃(aq)

• Silver Chloride (AgCl) is a white precipitate formed in this reaction.