Why does powdered sugar dissolve in water faster than granulated sugar?

Powdered sugar dissolves in water faster than granulated sugar primarily due to its smaller particle size and larger surface area. The fine particles of powdered sugar have more exposure to water molecules, allowing for quicker interaction and dissolution. Additionally, powdered sugar often contains a small amount of cornstarch, which can further enhance its solubility. Consequently, these factors contribute to the rapid dissolution of powdered sugar compared to granulated sugar.