Ostwald's Dilution Law (for weak electrolyte's)
For a weak electrolyte A+ B– dissolved in water, if α is the degree of dissociation then
Then according to law of mass action,
= dissociation constant of the weak electrolyte
[ C = 1/V, then V = 1/C (volume of solution in which 1 mole is present) is called dilution, So keq = α2/(1 - α) V]
If α is negligible in comparison to unity 1 – α = 1.
as concentration increases ⇒ α decreases
at infinite dilution α reaches its maximum value, unity.
If α is negligible in comparison to unity 1 – α = 1.
