What is meant by the presence of a common ion? How does the presence of a common ion affect an equilibrium such as HNO 2 (aq) ⇌ H + (aq) + NO 2 - (aq) What is an acid–base solution called that contains a common ion?

Interpretation:

The presence of a common ion is to be explained. The affect of the presence of a common ion on equilibrium of the given reaction is to be stated. The term used for an acid-base solution that contains a common ion is to be determined.

Concept introduction:

The presence of a common ion brings about a shift in the equilibrium position.

To determine: An explanation regarding the presence of a common ion.

The presence of a common ion shifts the equilibrium position.

The shift in the equilibrium state that happens due to the addition of an ion that is already present in the equilibrium reaction is stated as the presence of a common ion.

Interpretation:

The presence of a common ion is to be explained. The affect of the presence of a common ion on equilibrium of the given reaction is to be stated. The term used for an acid-base solution that contains a common ion is to be determined.

Concept introduction:

The presence of a common ion brings about a shift in the equilibrium position.

To determine: The affect of the presence of a common ion on equilibrium of the given reaction

The presence of a common ion shifts the equilibrium of the given reaction towards left.

The given reaction is,

HNO2(aq)⇌H+(aq)+NO2−(aq)

The presence of a common ion in the given reaction will reduce the solubility of the given acid shifting the equilibrium towards the left. The dissociation of the given acid will be suppressed.

Interpretation:

The presence of a common ion is to be explained. The affect of the presence of a common ion on equilibrium of the given reaction is to be stated. The term used for an acid-base solution that contains a common ion is to be determined.

Concept introduction:

The presence of a common ion brings about a shift in the equilibrium position.

To determine: The term used for an acid-base solution that contains a common ion.

An acid-base solution that contains a common ion is a buffer solution.

An acid-base solution that contains a common ion is a buffer solution.

A buffer solution is also defined as a solution that resists a change in the pH on addition of an acid or an alkali

A solution that resists a change in the pH on addition of an acid or an alkali is termed as a buffer solution