Question

What is the solubility order of lii, nai, ki, rbi, csi in water?

Answer 1

Hi there,

The compounds consist of Large anions such as I- the solubility can decrease with the increase in the cationic size of the Compound. On another hand, Alkaline Metals the decrease in association energy is a lot of fast than the decrease in lattice energy with the rise within the size of the ion. The solubility of alkaline Metal iodides could be in the following order :

LiI > NaI > KI > rbi > CsI

Hope it helped.

Answer 2

Answer: CsI < RbI < KI < NaI < LiI

Explanation:

According to Fajan's rule, larger cation/anion bonded with smaller anion/cation has greater solubility.