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Write the formula unit equation for te formation of "alum" from aluminum

Write the formula unit equation for te formation of "alum" from aluminum

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Answer #1

Alum is KAl(SO4)2.12H2O and is produced from aluminium

2Al(s) + 2KOH(aq) + 6H20(l) -----> 2K+(aq) +2Al(OH)4-(aq) + 3H2(g) ( ( addition of KOH to aluminium)

2Al(OH)4-(aq) + 3H2SO4(aq)------> 2Al3+(aq) + 3SO42-(aq) + 6H2O(l) ( Conversion of Aluminium hydroxide to aluminium sulfate)

Al(OH)4-(aq) + 3H2SO4(aq)------> 2Al3+(aq) + 3SO42-(aq) + 6H2O(l) ( addition of acid to Al(OH)4

K +(aq) + Al3+(aq) +2SO42-(aq) +12H2O(l) ------>KAl(SO4)2·12H2O(s)

formation of crystals of alum on cooling the solution

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