1.) The synthesis of alum crystals takes place according to four different chemi

Question

1.) The synthesis of alum crystals takes place according to four different chemical reaction steps, the first and fourth of which are detailed in the Introduction. Identify the balanced chemical reactions taking place during...

a.) the second step, when sulfuric acid is added to the Al(OH)4- solution to yield a solid aluminum hydroxide precipitate.

b.) the third step, when additional sulfuric acid neutralizes the basic aluminum hydroxide solid, causing it to dissolve in solution.

*Note: tihs is all the information given

Explanation / Answer

1) preparation of alum steps,

a) second step, when sulfuric acid reacts with Al(OH)4-, to form solid Al(OH)3 (ppt),

2Al(OH)4 + H2SO4 ---> 2Al(OH)3 + 2H2O + SO42-

b) the third step, reaction of Al(OH)3 with H2SO4, to form soluble aluminium sulfate,

2Al(OH)3 + 3H2SO4 ----> Al2(SO)4 + 6H2O

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