deprotonated acids and bases

[005754305]

Can someone explain how we can tell what is charged and what is nuetral when the pH is greater than the pKA for a simple HA+H20--> H+ ...

[Chem_Mod]

If your pH < pKa, you can think of your environment being very acidic. Thus, you don't need to make it more acidic, so you would favor HA (neutral species)
If your pH > pKa, you can think of your environment being very basic. To bring down the pH and therefore make the environment more acidic, you would favor A- (charged species)

Remember that A- and the production of H+/H3O+ is what contributes to the acidity of an environment.