Multiple Choice
According to solubility rules, are alkaline earth metal hydroxides (such as Ca(OH)_2 and Sr(OH)_2) considered very water-soluble?
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6. Chemical Quantities & Aqueous Reactions
Solubility Rules
Multiple Choice
Which of the following usually makes a substance dissolve faster in a solvent?
A
Using a solvent with lower polarity
B
Decreasing the surface area of the solute
C
Increasing the temperature of the solvent
D
Reducing the stirring or agitation
Verified step by step guidance1
Understand that the rate at which a substance dissolves in a solvent depends on factors that increase the interaction between solute and solvent particles.
Recognize that increasing the temperature of the solvent generally increases the kinetic energy of the molecules, causing them to move faster and interact more frequently, which speeds up dissolution.
Note that using a solvent with lower polarity usually decreases solubility for polar solutes, so it does not typically make a substance dissolve faster.
Understand that decreasing the surface area of the solute reduces the exposed area for solvent interaction, which slows down the dissolution process; increasing surface area speeds it up.
Realize that reducing stirring or agitation decreases the movement of solvent around the solute, slowing dissolution; increasing stirring helps dissolve substances faster.
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