1. Tardigrade
  2. Question
  3. Chemistry
  4. Knowing that radius of Na +> Mg 2+ and radius of S 2-> Cl -, predict which compound will be least soluble in polar solvent?

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Q. Knowing that radius of $Na ^{+}> Mg ^{2+}$ and radius of $S ^{2-}> Cl ^{-},$ predict which compound will be least soluble in polar solvent?

Chemical Bonding and Molecular Structure

Solution:

Smaller size of cation, larger size of anion and high charge favours polarisation thus more covalenf character. As covalent character increases, solubility in polar solvent decreases because covalent compounds are non-polar.