Recrystallisation of copper sulfate C0068

Greenhouse chemistry
Recrystallisation of copper sulfate
Errors and safety advice
Wear safety spectacles and wash off any material that comes in contact with skin immediately
2mins 50sec Do not use boiling water as this is too risky and unnecessary
7mins 50sec Error. Water evaporates, not the copper sulfate crystals
The Experiment
I wanted to see if I could carry out a recrystallisation of an ionic solid in the greenhouse using only materials commonly found at home.
250g of copper sulfate was obtained online for a couple of pounds
The copper sulfate from the online supplier was a greenish solid in colour, rather than the expected bright blue crystals.
A sample of the greenish solid was dissolved in hot water and filtered to remove any insoluble impurities.
The filtrate was placed in a bowl and left to stand overnight. Water evaporated and crystals of copper sulfate formed.
The crystals were removed from the solution by filtration and washed with de-ionised water.
Blue copper sulfate crystals were obtained.