Calculate the volume of 6.0M sulfuric acid, H2SO4, required to neutralize all excess potassium, KOH, remaining after the first step in the synthesis of alum. Synthesis of Alum: i. Aluminum metal reac

Question:

Calculate the volume of 6.0M sulfuric acid, H2SO4, required to neutralize all excess potassium, KOH, remaining after the first step in the synthesis of alum. Synthesis of Alum:

i. Aluminum metal reacts rapidly with a hot aqueous solution of potassium hydroxide to produce a soluble potassium aluminate salt:

2Al (s) + 2K+ (aq) + 2OH- (aq) +10H2O (l) –> 2K+(aq) +2[Al(H2O)2(OH)4]- (aq)+ 3H2 (g)

ii. this salt is reacted with sulfuric acid which precipitates

2K+ (aq) +2[Al(H2O)2(OH)4]- (aq)+ 2H+ (aq) + SO42- (aq) –> 2K+ (aq) + SO42- (aq) +2Al(H2O)3(OH)3 (s)

iii. it then dissolves as additional acid is added

2Al(H2O)3(OH)3 (s) +6H+ (aq) + 3SO42- (aq) –>2Al3+ (aq) + 3SO42- (aq) +12H2O (l)

1g of aluminum, 25mL of 3M KOH, and 30mL 6M H2SO4 is used.