Question

On adding a drop of Barium Chloride solution to an aqueous solution of sodium sulphite, white precipitate is obtained.
a)Write a balanced chemical equation of the reaction involved.
b) What other name can be given to this precipitation reaction?
c) On adding dilute hydrochloric acid to the reaction mixture, white precipitate disappears. Why?
(class 10 CBSE SAMPLE PAPER 2017-18 SCIENCE)

Answer 1

Solution:

a)On adding a drop of Barium Chloride solution to an aqueous solution of sodium sulphite, white precipitate is obtained.This  white precipitate is a barium sulphite.

BaCl2 + Na2SO3------>BaSO3 + 2NaCl

b) This reaction is also a double displacement reaction.

c) On adding dilute hydrochloric acid to the reaction mixture, Barium Chloride ,Sulphur dioxide and water are formed. Since Barium  chloride is a soluble substance thus, white precipitate disappears.

BaSO3 + HCl --------> BaCl3 + SO2 + H2O.

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Answer 2

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