Answer: Small crystals of solute are dropped into a warm solvent and then stirred.
Explanation:
Rate of solubility of solids in solvent varies as follows:
Temperature: Increasing the temperature means more solute can be dissolved in the given amount of solvent because the energy of the solute particles increases and more it can interact with the solvent particles. The rate of dissolution of solid also increases in liquids.
Size of the solute particles: If the solute particles is present in smaller size, more it can be dissolved because decreasing the size increases the surface area of the solute particles. Hence, the dissolution increases.
Stirring: This process brings fresh solvent particles to come in contact with the solute particles and hence, fast stirring increases the rate of dissolution.
Thus the solute will dissolve most quickly when small crystals of solute are dropped into a warm solvent and then stirred.
