preparation of Alum pre lab - Name: Hoa Chung Date:...

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Name: Hoa ChungDate: February 18 2016Preparation of Alum,Aluminum Potassium SulfateDodecahydrate, from AluminumExperimental ProcedurePart 1: First Lab Period1.Cut a piece of aluminum metal from the aluminum can, then cut metal into small squares(1x1 cm) for easy dissolution.2.Weigh about 1.0 g of metal pieces to ±0.001g on weighing paper, and then place it in aclean 250 mL beaker.3.Add about 35 mL of de-ionized water and 12 mL of 6 M KOH solution to the beaker.4.Heat the mixture on a shared hot plate set at “LO”.5.Stir the solution constantly, hydrogen will evolve.2Al(s)+ 2KOH(aq)+ 6H2O2KAl(OH)4 (aq)+ 3H2 (g)Continue to heat until no more hydrogen bubbles is seen.6.When the aluminum has completely dissolved, gravity filter the cool solution through afilter paper, then collect the filtrate in a 400 mL beaker. Rinse the first beaker with lessthan 20 mL DI water and combine the filtrate.7.Add 10 drops of methyl red solution to the clear colorless solution.

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Sulfuric acid, mL beaker, alum crystals, Hoa Chung

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