When you add sugar to a cold drink, you may stir it to help the sugar dissolve. If you don’t stir, the sugar may eventually dissolve, but it will take much longer. Stirring is one of several factors that affect how fast a solute dissolves in a solvent. Temperature is another factor. A solid solute dissolves faster at a higher temperature. For example, sugar dissolves faster in hot tea than in ice tea. A third factor that affects the rate of dissolving is the surface area of the solute. For example, if you put granulated sugar in a glass of ice tea, it will dissolve more quickly than the same amount of sugar in a cube. That’s because granulated sugar has much more surface area than a cube of sugar. You can see videos of all three factors at these URLs
To demonstrate solubility to her class, Professor Johnson shows her students several examples of salt dissolving in water. In one experiment, she is showing her students how salt dissolves differently when added to water of differing temperatures. Glass A is filled with ice water and Glass B is filled with hot water.
Will the salt in Glass B dissolve faster or slower than the salt in Glass A?