1st LAB SYNTHESISf

1st LAB SYNTHESISf - Richard Yoon 10/01/07 4th hour...

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Richard Yoon 10/01/07 4th hour Synthesis of Alum I. Introduction This experiment will synthesize the ionic compound Potassium aluminum sulfate, [KAl(SO4)2]. This will require a water solution containing potassium, aluminum and sulfate ions. The aluminum will be derived from oxidized aluminum foil. II. Purpose The purpose of this lab is to make a sample of alum by making a solution of K+, Al3+, SO4 , and distilled water and evaporating the water. When the water is evaporated the compound KAl(SO4)2*12H2O will be crystallized. III. Procedures 1) Weight out 1 gram of Aluminum foil to the nearest centigram and place it into the beaker. Add 3 M KOH solution into the beaker and watch it dissolve. Then filter the remaining solution. 2) Acidify the solution slowly with 3 M H2SO4. Wait for a solid to appear then filtrate again with the Buchner funnel. Then boil the solution until the water evaporates until about 50 ml of solution is left. Cool the solution and let it rest undisturbed ( it will be Supersaturated). 3) Cool the solution in an ice bath for 15 minutes. Crystals will form while in the ice bath. When crystals do form place them into the Buchner funnel and filter again. IV. Data Collection 1.07g of Al foil reacted 16.04g of alum produced V. Data Analysis Pre-lab Questions 1. What is alum? Alum is a compound which is combinations of mono and tri-positive cations that yield crystals of same stoichiometry and structure. Alum is a double salt.
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2. What is a hydrated crystal?
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1st LAB SYNTHESISf - Richard Yoon 10/01/07 4th hour...

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