Iodine Sublimation

Sublimation  is the change of a soldid substance directly to a vapor without passing through the liquid state. The term is also used to describe the reverse process of the gas changing directly to the solid again upon cooling. An exemple of sublimation is seen when iodine, on being heated, changes from a dark solid to a purplish vapor that condenses directly to a cristalline solid upon a striking a cool surface. In this way pure crystatls of iodine are prepared.

CHROMATOGRAPHY

This week we´ve been working in a new practice: Chromatography.
This technique can be used to separate mixtures of coloured compounds.
We used chard and spinach leaves to separate their pigments. We've cut the leaves in small pieces,mash them, mix them with alcohol and sand and filter it... Do you want to Know more about this practice? Watch this video!



 

Lab life!