State what happens to crystals or washing soda when exposed to air. Name the phenomenon exhibited.

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Solution

When washing soda $(N a_{2} C O_{3} .10 H_{2} O)$ is exposed to air, it loses 9 molecules of water to form its monohydrate. That is,

$N a_{2} C O_{3} .10 H_{2} O A i r \to N a_{2} C O_{3} . H_{2} O + 9 H_{2} O$
This phenomenon is called as efflorescence.
Efflorescent substances lose their water of crystallisation when exposed to atmosphere.

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Q. What happen to the crystals of washing soda when exposed to air? Name the phenomenon exhibited.

State your observations when

(a) Washing soda crystals

(b) Iron (III) chloride salts are exposed to atmosphere.

(a) State what happens when:
(i) Copper sulphate solution is electrolysed using a platinum anode.
(ii) Excess ammonia is passed through an aqueous solution of lead nitrate.
(iii) Washing soda is left exposed to dry air for long time.
(iv) Silver nitrate solution is added to dil. HCl.
(v) Hot concentrated sulphuric acid is added to sodium chloride crystals.

What would you observe when crystals of Washing soda when exposed to air. Name the phenomenon exhibited?

What happens to the crystals of washing soda when exposed to air?

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State what happens to crystals or washing soda when exposed to air. Name the phenomenon exhibited.

When washing soda (Na2CO3.10H2O) is exposed to air, it loses 9 molecules of water to form its monohydrate. That is, Na2CO3.10H2OAir→Na2CO3.H2O+9H2O This phenomenon is called as efflorescence. Efflorescent substances lose their water of crystallisation when exposed to atmosphere.