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Exp 12 Synthesis: Preparation of Alum Alum: potassium aluminum sulfate dodecahydrate

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Exp 12 Synthesis: Preparation of Alum Alum: potassium aluminum sulfate dodecahydrate KAl(SO 4 ) 2 . 12H 2 O 1.) 2 Al (s) + 2 KOH (aq) + 6 H 2 O (l)  2 K[Al(OH) 4 ] (aq) + 3 H 2(g) 2.) K[Al(OH) 4 ] (aq) + 2 H 2 SO 4(aq)  KAl(SO 4 ) 2(aq) + 4 H 2 O (l)

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Exp 12 Synthesis: Preparation of Alum

Alum: potassium aluminum sulfate dodecahydrate

KAl(SO4)2. 12H2O

1.) 2 Al(s) + 2 KOH(aq) + 6 H2O(l)  2 K[Al(OH)4](aq) + 3 H2(g)

2.) K[Al(OH)4](aq) + 2 H2SO4(aq)  KAl(SO4)2(aq) + 4 H2O(l)

KAl(SO4)2(aq) cooled  KAl(SO4)2. 12H2O(s)

Goal of experiment:

% yield Alum = actual yield (exp), g x 100%

theo yield (calc), g

Exp. 12 – video (time: 6:08 minutes)

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Cautions:

1.) heat gently – if heat too fast, it will overflow

2.) heat until all Al dissolves (transparent paint flakes without

shinning back)

3.) first filtering is with regular funnel with small amount of glass

wool to catch paint flakes; filter into 250 mL beaker

4.) after ice bath, filtering is done with suction funnel to aspirate

filtrate from solid.

a.) obtain mass of funnel and wet filter paper

b.) clamp flask to ring stand, connect tube to flask and

aspirator, insert funnel, turn on water

c.) filter sample

d.) wash sample with portions of 1:1 ethanol-water ; do not

use pure deionize water.

e.) disconnect the tube to the aspirator and turn off water

f.) obtain mass of funnel, wet filter paper, and wet solid.

Difference gives mass of wet solid.

5.) experiment is done in groups of 4

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