Question

What is the common ion effect?

• A. When the addition of an ion common to two solutes causes precipitation or reduces ionization.
• B. When a molecule is added to a solution and causes precipitation or reduces ionization
• C. When the subtraction of an ion common to two solutes causes precipitation or reduces ionization.
• D. The effect of adding ions to a solution.
• E. When any ion is added to a solution and causes precipitation or reduces ionization.

Answer 1

The correct option is A When the addition of an ion common to two solutes causes precipitation or reduces ionization.

The common ion effect is observed when the addition of an ion common to two solutes causes precipitation or reduces ionization.
Thus, if to a solution of a weak electrolyte, a solution of strong electrolyte is added which furnishes an ion common to that furnished by the weak electrolyte, the ionization of the weak electrolyte is suppressed.