Question

How do you determine the rate of dissolution?

Answer 1

Dissolution is a process in which the solute particles or molecules come in contact with the solvent molecules and get dissolved in it.
The rate of dissolution is the speed of the solubility of those solute particles, which would depend on a number of factors.

Complete step-by-step answer: The determination of the rate of dissolution of a solid in a liquid, depends on a number of factors. We know that the dissolution of a solid in a liquid takes place because of the collisions which take place between the molecules of the solvent and the solid particles of solute. The increase of the collision frequency can be carried out by increasing the kinetic energy of the particles.
The meaning of dissolution is the solubility of the solute particles in a given solvent. It can be expressed as,
Solid solute $\xrightarrow{solvent}$ dissolved solute
Now, we will discuss some of the factors, on which the rate of dissolution of a solid depends.
Surface area is one of the major factors, in other words, size of the particles of solute is a factor on which the rate of dissolution depends. Meaning, a number of small pieces or grounded solute particles would dissolve faster than a large chunk of solid solute, because it has more surface area involved.
Next factor is temperature. With increase in temperature the kinetic energy of the molecules will also increase, which will result in higher collision frequency and hence more dissolution.
And the last factor is agitation of the solvent. For instance, the sugar particles would be more soluble in the solvent if we stir it a bit.

Note: The dissolution of a solute depends on the size of the particles of solute and the solvent, temperature at which the process is taking place, meaning higher temperature would mean higher dissolution because of the increased kinetic energy.
The last factor is agitation of the solvent or stirring of the solvent, which would increase the rate of dissolution of the solute molecules.