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Potassium alum is a double sulfate or white crystal salt of potassium. Potassium alum crystallizes in octohedral patterns and is soluble in water. If heated, it will melt.
Aluminum is easily separated from iron since aluminum (but not iron) dissolves readily in hot aqueous potassium hydroxide according to the equation:

2Al(s) + 2KOH(aq) + 6H2O(l)®2KAl(OH)4(aq) + 3H2(g)

The addition of sulfuric acid first forms the precipitate Al(OH)3, which dissolves when the solution is warmed.

2KAl(OH)4(aq) + H2SO4(aq) ----2Al(OH)3(s) + K2SO4(aq) + 2H2O(l)

2Al(OH)3(s) + K2SO4(aq) + 3H2SO4 -----2KAl(SO4)2(aq) + 6H2O(l)

On cooling, alum forms according to the following reaction:

KAl(SO4)2+ 12H2O(l) ------ KAl(SO4)2×12H2O(s)

Thus, the overall equation for the formation of alum from aluminum is:

2Al(s) + 2KOH(aq) + 4H2SO4+ 22H2O(l) ------- 2KAl(SO4)2×12H2O(s) + 3H2(g)

moreover question can be asked about its uses andproperties