Step-by-step explanation:
When we stir the solute in a solution then rate of dissolution increases as size of solute particles rapidly decreases on stirring.
On the other hand, when we do not stir the solute in a solution then rate of dissolution decreases.
For example, when we stir salt in water it readily dissolves but when we do not stir salt in water then either it takes long time to dissociate or it does not get dissolved.