Physical Chemistry> Chemical Bonding...

What is solvation of ions?Explain in detail.

Menka Malguri , 13 Years ago

Grade 12th Pass

2 Answers

RAJORSHI PAUL

Last Activity: 13 Years ago

Ashwin Muralidharan IIT Madras

Last Activity: 13 Years ago

Hi Menka,

Solvation, also sometimes called dissolution, is the process of attraction and association of molecules of a solvent with molecules or ions of a solute. As ions dissolve in a solvent they spread out and become surrounded by solvent molecules.

Dissolution of Ionic Compounds:

For ionic compounds, dissolution takes place when the compounds ionize. This most commonly occurs in polar solvents, such as water or ammonia.

NaCl_(s) → Na⁺_(aq) + Cl^-_(aq)

In a colloidal dispersed system, ion dissolution arises, where the dispersed particles exist in equilibrium with their saturated counter part, i.e.

NaCl_(s) → Na⁺_(aq) + Cl^-_(aq)

The behavior of this system is characterised by the activity coefficients of the components and the solubility product, defined as:

$a_{Na^ + } \cdot a_{Cl^ - } = K_{sp}$

The ability of an ion to preferentially dissolve (as a result of unequal activities) is classified as the Potential Determining Ion. This in turn results in the remaining particle possessing either a net positive/negative surface charge.

Have also posted answers to some of you other previous posts in Mathematics. You can learn some shortcuts there.

Hope that helps.

All the best,

Regards,

Ashwin (IIT Madras)