Experiment B: Stoichiometry And Reactions In Aqueous Solutions

Question 0

What are the steps to forming alum from aluminum scraps?

Answer 0

1) Al(s)+KOH(aq)+H2O->K+(aq)+Al(OH)4-(aq)+H2(g)
2) Al(OH)4-(aq)+H2SO4(aq)->Al(OH)3(s)+H2O+ SO4-2(aq)
3) Al(OH)3(s)+H2SO4(aq)->Al+3(aq)+SO4-2(aq)+H2O

Question 1

What is the IUPAC name for KAl(SO4)2x12H2O? It’s common name?

Answer 1

Potassium aluminum sulfate dodecahydrate

Common name: alum

Question 2

What does amphoteric mean?

Answer 2

The substance can react with either an acid or a base

Question 3

How would you convert mass of MgNH4PO4x6H2O to the equivelant mass of P2O5?

Answer 3

Assume all of the P initially in the fertilizer ends up as magnesium ammonium phosphate hexahydrate and use stoichiometry