What is common ion effect in equilibrium?
Table of Contents
What is common ion effect in equilibrium?
The common-ion effect refers to the decrease in solubility of an ionic precipitate by the addition to the solution of a soluble compound with an ion in common with the precipitate. This behaviour is a consequence of Le Chatelier’s principle for the equilibrium reaction of the ionic association/dissociation.
In which of the following cases common ion effect is observed?
An example of the common ion effect can be observed when gaseous hydrogen chloride is passed through a sodium chloride solution, leading to the precipitation of the NaCl due to the excess of chloride ions in the solution (brought on by the dissociation of HCl).
How does the common on affect change the equilibrium of an acid base reaction?
Common Ion Effect with Weak Acids and Bases The common ion effect suppresses the ionization of a weak acid by adding more of an ion that is a product of this equilibrium. Adding a common ion to a system at equilibrium affects the equilibrium composition, but not the ionization constant.
What is common ion effect explain with the help of an example?
The common ion effect is the phenomenon in which the addition of an ion common to two solutes causes precipitation or reduces ionization. An example of the common ion effect is when sodium chloride (NaCl) is added to a solution of HCl and water.
What is common ion effect illustrate?
How does the presence of a common ion shift the equilibrium established in the dissociation of a weak acid?
Le Châtelier’s Principle states that if an equilibrium becomes unbalanced, the reaction will shift to restore the balance. If a common ion is added to a weak acid or weak base equilibrium, then the equilibrium will shift towards the reactants, in this case the weak acid or base.
What is the effect of an common ion on the degree of dissociation?
The phenomenon in which the degree of dissociation of any weak electrolyte is suppressed by adding a small amount of strong electrolyte containing a common ion is called a common ion effect. Where ‘Ka’ is the dissociation constant of acid. Here CH3COO– ions are common hence their concentration increases.