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p-Block Elements – I — Chemistry STD 12 — Question

Tamilnadu BoardEnglish MediumSTD 12Chemistryp-Block Elements – I3 Marks
Question
How will you prepare potash alum?
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Answer

The alunite the alum stone is the naturally occurring form and it is $K _2 SO _4 \cdot A _{12}\left( SO _4\right)_3 \cdot 4 Al ( OH )_3$. When alum stone is treated with excess of sulphuric acid, the aluminium hydroxide is converted to aluminium sulphate. A calculated quality of potassium sulphate is added and the solution is crystallised to generate potash alum. It is purified by recrystallisation.
$K _2 SO _4 \cdot A _{12}\left( SO _4\right)_3 \cdot 4 Al ( OH )_3+6 H _2 SO _4 \rightarrow K _2 SO _4+ Al _2\left( SO _4\right)_3+12 H _2 O$
$K _2 SO _4+ A _{12}\left( SO _4\right)_2+24 H _2 O \rightarrow K _2 SO _4 \cdot A _{12}\left( SO _4\right)_3 \cdot 24 H _2 O$

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