What do you mean by a precipitation reaction? Explain by giving examples
Answer: Reactions in which precipitate is formed are called precipitation reactions. Generally in a precipitation reaction insoluble salts are settled down as precipitate.
Na2SO4 (aq) + BaCl2 (aq) ⇨ 2NaCl (aq) + BaSO4 (s)
In the above reaction, when sodium sulphate reacts with barium chloride, the white precipitate of barium sulphate is formed along with the sodium chloride.