Ion Concentrations

• when ionic compounds are dissolved in water they contain cation and anion seperate from each other.
• this process is called DISSOCIATION
• Dissociation: is the process in which this happens

Dissociation
ionic compunds are made up of two parts:
-cation - positively charged particles
- anion - negatively charged particles

• when writing dissociation equations the atoms and charges must balance

                ex : Fe(OH)2 ----> Fe 2+ + 2 OH -

EXAMPLE :

Determine [Na+] and [PO4   3-] in a 1.5 M solution of Na3PO4

Na3PO4 ---> 3 Na +    +        PO4 3-

1.5 M  x   3     =  4.5 M = [Na+]
                1

Nicole H