chemistry

Solubility Product Constant (Ksp)

Solubility  Product Constant (Ksp):
simply the measure of solubility
The product of equilibrium concentrations
 of  positive and negative ions in a
 saturated solution of a dissolved salt
is called solubility product constant.

Ag Cl (s)   ⥨   Ag+ +  Cl– 
Consider a saturated solution of a sparingly soluble salt AgCl . A dynamic equilibrium is established b/w the undissolved salt & its dissociated positive &negative ions in the solution. i.e.

Ag Cl (s)  ⥨   Ag+ +  Cl
 
From law of mass action , we have 
Kc =  [Ag+] [ Cl- ]/ [ AgCl ]
Kc  [AgCl ] [Ag+] [ Cl- ]
Kc x K [Ag+] [ Cl- ]
Ksp [Ag+] [ Cl- ]
 As Ag Cl is a solid  & its concentration
 remains constant due to very
light dissociation, so we can write as:
  

Leave a Reply

Fill in your details below or click an icon to log in:

WordPress.com Logo

You are commenting using your WordPress.com account. Log Out /  Change )

Google photo

You are commenting using your Google account. Log Out /  Change )

Twitter picture

You are commenting using your Twitter account. Log Out /  Change )

Facebook photo

You are commenting using your Facebook account. Log Out /  Change )

Connecting to %s