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PREPARATION OF(POTASSIUM)ALUM

Name_____________________________Section______

Week One:

Form of aluminum used:________ Mass of aluminum used:_____________

Moles of 4M KOH used:_________________________

The balanced equation for the reaction of potassium hydroxide and aluminum:

Moles of 6M H2SO4 used:________________________

The balanced equation(s)for the reaction of sulfuric acid:

The balanced equation(s)for the formation of alum from its components:

Mass of alum crystals obtained:______________________________

Theoretical yield of alum:___________ %yield of alum:______________[Show calculations]

Week Two:

Observed melting point (range)of“standard”alum:_______Literature MP of alum:_________Observed melting point (range)of synthesized alum:____________Corrected MP:_________Comment on any corrections that were needed in obtaining the M.P.of your alum and on theagreement between the MP of your sample and the expected MP.

DESCRIBE ANY TESTS PERFORMED ON YOUR ALUM ON THIS SHEET.BE SURE TOINCLUDE ALL CHEMICAL REACTIONS.

Post Lab discussion Questions:

1. How did this lab conform to the 12 Green Principles of Chemistry?Which Principles?

2. W„ hat im‟provements could be made to this lab?Any improvements to make this labgreener ?

3. Were there any parts to this lab that violated the 12 Principles? If so,which ones and why?

4. List some of the concerns associated with Aluminum production from raw ore.

5. What are the advantages to recycling aluminum as compared with Al production via the ore?

6. If recycling one aluminum can saves the energy equivalent of 1 cup of gasoline(8 oz),howmuch energy could you save in a year if you recycled two aluminum cans per day?How manygallons of gas is this?How much would that gas cost?