crystallisation

What method should a student use to extract pure hydrated copper sulfate from a solution of blue hydrated copper sulfate ?

Crystallisation

Crystallisation is a _______ technique used to separate _______ solids from a _____.

Separation, dissolved, solvent

The first step of crystallisation

Filtration to remove any insoluble solids

Equiptment needed

Tripod, gauze, evaporating basin, filter paper, funnel, beaker, bunsen burner

In step two, you should heat the ______ to ____ off about ___ of the liquid.

Solution, boil, half

After boiling off about half of it…

Leave the remaining solution to cool and evaporate over time

When the ______ have formed, pat them with a tissue or ____ towel to ___ them.

Crystals, paper, dry

What is anhydrous copper sulphate?

A white solid

If the question asks for a ______ salt, only boil off half of the water, if they ask for ______, boil it off completely

Hydrated, anhydrous

What happens when Cl2 is bubbled through a solution of NaBr?

Chlorine displaces the bromide ions, this leads to the formation of Bromine which is orange

Reactivity decreases ____ group 7

Down

Why does reactivity decrease down group 7?

Atoms become larger and gain more electron shells, making it harder to attract and gain the one electron needed to fill the outer shell

Why does reactivity increase down group 1?

Because atomic sizes increases and electron shielding grows, making it easier for the single outer electron to be lost

What do we add in excess?

The base

Why do we add the base in excess?

To ensure all the acid is used up

What is the name liquid that passes through the filter papet?

Filtrate