How does shaking or stirring a mixture of solute and solvent affect a solution?

Question

BlackTom AI · Accepted Answer

Consider what stirring or shaking does to a solid dissolving in a liquid. 
Option 1: It increases the rate of dissolving. This is correct because stirring reduces the thickness of the boundary layer of solute-rich solution around the undissolved solid, brings fresh solvent into contact with the solute, and helps transport dissolved particles away, all of which speed up how fast dissolution occurs.
Option 2: It decreases the rate of dissolving. This is incorrect; stirring does not impede dissolution; it typically helps it by enhancing mixing and mass transfer.
Option 3: It increases the solubility of the solute. This is a common misconception. Solubility is the maximum amount of solute that can dissolve at a given temperature and pressure; stirring cannot change that limit, only how quickly you approach it.
Option 4: It decreases the solubility of the solute. This is also incorrect for the same reason: stirring does not reduce the solubility, though temperature or pressure changes could alter solubility.
In summary, the practical effect of shaking or stirring is to speed up dissolution without changing the intrinsic solubility at a fixed temperature and pressure.

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