Synthesis of Alum, KAl(SO4)2.12H2O



The formula of alum is KAl(SO4)2.12H2O.

Calculating yields:
mol Al1 mol alum474.32 g alum
Theoretical yield = grams Al used x -------------- x -------------- x ------------------- = g alum
26.98 g Al1 mol Almol alum
actual yield, g
% yield = -------------------- x 100%
theoretical yield, g


Note: the following is not a procedural check-list; that is contained in the lab handout. This is a brief summary of that procedure including tips, suggestions, and deviations from the procedure detailed in the handout. It is not a substitute for reading the procedure in the handout before coming to lab.

The synthesis will be carried out in the following stages:

Work in pairs.

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