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suppression of the degree of dissociation of a weak electrolyte by the
addition of a strong electrolyte having an ion in common with the weak
electrolyte is called the common ion effect.
H2SO4 ® 2H+ + SO42-
product of the ionic concentration of the ions of a sparingly soluble
electrolyte present in its saturated solution at a given temperature is
called a solubility product of the electrolyte.
For a salt,
+ B- Ksp = [A+] [B-]
+ 2B- Ksp = [A2+] [B-]2
+ B2- Ksp = [A+]2
In qualitative analysis:
Prediction of precipitation: