how is potash alum prepared?
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Aluminum metal is treated with hot aqueous KOH
solution. Aluminium dissolves as potassium aluminate,
KAl(OH)4, salt.
2Al(s) + 2KOH(aq) + 6H2O(l) 2KAl(OH)4 (aq) + 3H2
Potassium aluminate solution on treatment with dil.
Sulphuric acid first gives precipitate Al(OH)3, which
dissolves on addition of small excess of H2SO4 and
heating.
2KOH(aq) + H2SO4(aq) 2Al(OH)3 (s) + K2SO4(aq) + 2H2O(l)
2Al(OH)3 (s) + 3 H2SO4(aq) Al2(SO4)3(aq) +6H2O(l)
The resulting solution is concentrated to near saturation
and cooled. On cooling crystals of potash alum
crystallize out.
K2SO4(aq) + Al2(SO4)3(aq) + 24H2O(l) K2SO4.Al2(SO4)3. 24H2O(s)
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Answered by
1
Answer:
by heating the powder of it with water and make a super saturated solution and then keep i for cooling then the crystals of the potash alum will be formed
Explanation:
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