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

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Solution

Washing soda undergoes efflorescence and as a result loses nine molecules of water to form white powder

$N a_{2} C O_{3} \cdot 10 H 2 O \to N a_{2} C O_{3} . H_{2} O + 9 H_{2} O$

Washing soda Washing powder

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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.