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12 grade chemistry others

Why LiI is more soluble than KI in ethanol?

Aniket Singh

1 Year agoGrade

1 Answer

Askiitians Tutor Team

1 Year ago

Lithium iodide (LiI) is typically more soluble in ethanol than potassium iodide (KI) due to a combination of factors related to the size and charge of the ions involved.

Ion size: Lithium (Li+) ions are smaller than potassium (K+) ions. In general, smaller ions tend to be more soluble in polar solvents like ethanol because they can more easily interact with the solvent molecules. The smaller size of Li+ ions allows them to form stronger interactions with the polar solvent molecules.

Ion charge: Lithium ions have a +1 charge, while potassium ions have a +1 charge as well. However, because lithium is smaller, its charge density (charge per unit area) is higher than that of potassium. Higher charge density makes it easier for lithium ions to attract and interact with the negatively charged ends of ethanol molecules (the oxygen atoms), leading to stronger ion-dipole interactions.

Lattice energy: When salts like LiI and KI dissolve in a solvent like ethanol, they break apart into their constituent ions. The energy required to break the ionic bonds and separate the ions from each other is known as lattice energy. Since LiI has smaller ions with stronger interactions, it generally has lower lattice energy than KI. Lower lattice energy makes it easier for LiI to dissolve in ethanol.

In summary, the smaller size and higher charge density of lithium ions, along with their lower lattice energy, contribute to the greater solubility of LiI in ethanol compared to KI. These factors favor the interaction between LiI ions and ethanol molecules, leading to a more soluble solution.

is Pradeep Chemistry+Ncert sufficient for all of the theory of Jee Mains Chemistry?

Hi, I’m a self-study JEE 2027 aspirant with a large 11th backlog. Since I don’t think 6–8 hour one-shots are sufficient to cover the full theory + breadth of problem types of a JEE chapter, I’ve shifted from lecture-based preparation to book-based self-study.

I have a problem with using NCERT as my primary chemistry source. In my experience, it is concise and information-heavy, but often lacks detailed explanations, systematic organisation of concepts, and categorisation of problem types. This seems especially problematic for Physical and Organic Chemistry, where I feel that simply reading NCERT may not give enough depth or problem-solving preparation.

So I’m considering this approach:

Pradeep Chemistry → complete the chapter thoroughly from Pradeep → then read NCERT for that chapter → solve JEE Main PYQs/problems.

My main question is:

Is Pradeep + NCERT sufficient as the complete theory source for JEE Main-level Chemistry?

In other words, after thoroughly completing a chapter from Pradeep and then NCERT, can I consider the theory part of that chapter complete for JEE Main, with only PYQs/problem practice remaining?

I’m asking specifically about JEE Main level, not Advanced.

Also, if Pradeep is not sufficient, what specific gap does it leave, and what would you recommend as a better book-based alternative for self-study?

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