# How can I calculate the molarity of a saturated solution?

##### 1 Answer

If you know the equilibrium constant for the solubility (sometimes called the solubility product constant), then you can set up and solve an equilibrium equation to find the molarity.

Example: What is the molarity of a saturated solution of lead chloride (

Solution:

Start by writing the chemical equation for dissolving the salt:

Next write the equation for the equilibrium constant. Remember that only the dissolved aqueous species contribute to the equation:

If a saturated solution contains an unknown concentration

The

Solving the last equation for