purification of an
impure solid
objective:

to obtain pure, solid aluminum potassium sulfate (alum) from an
impure sample

chemical formula –
procedural notes:

obtain approximately 3-5 grams of the impure mixture; record
initial mass

describe the mixture

dissolve impure mixture in the smallest amount of water possible

hot things are hot (Bunsen burners, heated glassware, etc)

write out procedure in lab notebook; check with spagna before you
start!!

record observations throughout experiment

warm the entire mixture before filtration – why??

do not evaporate all of the water – stop when only a small
amount of water remains; if solid crystals form, add water and
start again

label your groups beaker; leave overnight

goggles are required