3- OSMOTICITY - TONICITY:

OK! Two more concepts for you: OSMOTICITY AND TONICITY OF A SOLUTION.

Before we go further, please make sure that you are confortable with the following terms:

- Molarity

- Osmolarity

- Osmosis

OSMOTICITY is a term we use to compare the osmolarity of a solution with the osmolarity of another solution.

TONICITY represents the ability a solution has to change the shape of cells that are immersed in it. The solution change the shape of cells by altering their internal water volume. Put simply, it represents the ability of a solution to grab water from the cells.