* Left: In the previous experiment you put 2 g of different soils into the vials 1, 2, 3, 4, T, * mixed them with 5 ml distilled water, *  closed these vials, shaked them for a while and left them for sedimentation.
* Middle: Transfer 1 ml samples of the solutions to a plastic surface.
* Leave the solutions for drying.
Observation:
All samples leave a white residue.
Right: The clay sample from the Red Sea (T) shows salt crystals.