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Polar Molecules

On adding a d...

Question

On adding a drop of barium chloride solution to an aqueous solution of sodium sulphite, white precipitate is obtained. On adding dilute hydrochloric acid to the reaction mixture, white precipitate disappears. Why?

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Solution

$B a C l_{2} + N a_{2} S O_{3} ⟶ B a S O_{3} (w h i t e p p t .) + 2 N a C l$

$B a S O_{3} + 2 H C l ⟶ B a C l_{2} + S O_{2} + H_{2} O$

Due to the formation of $B a C l_{2}$ which is soluble in water the white ppt. disappears.

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Question 43

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?

Q. On adding a drop of barium chloride solution to an aqueous solution of sodium sulphite, white precipitate is obtained. What other name can be given to this precipitation reaction?

Q. On adding a drop of barium chloride solution to an aqueous solution of sodium sulphite, white precipitate is obtained. Write a balanced chemical equation.

Q. On adding a drop of barium chloride solution to an aqueous solution of sodium sulphite, a white precipitate is obtained.

What is the balanced chemical equation of the reaction involved?

Q. Assertion :On adding dilute hydrochloric acid to the reaction mixture, white precipitate disappears. Reason:

B a S O_{3}

is a salt of a weak acid

(H_{2} S O_{3})

, therefore dilute acid such as

H C l

decomposes barium sulphite to produce sulphur dioxide gas which has the smell of burning sulphur.

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