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What do you mean by precipitation reactions? Explain giving examples.

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On mixing the clear solutions of two ionic compounds, a substance which is insoluble in water, is formed. This insoluble substance formed is known as precipitate. Any reaction that produces a precipitate is called a precipitation reaction' When sodium sulphate solution is mixed with barium chloride solution, a white substance BaSO4 is formed.

The white precipitate of BaSO4 is formed by the reaction of SO4-2and Ba2+. The other product formed is sodium chloride which remains in the solution.

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