Explain why NaCl is water soluble and NaI is not water soluble.
Answers
Answer:
For a compound to be soluble, the hydration energy must be greater than the lattice energy . Since, NaCl is soluble in water but insouble in bezene.
Strong sodium ions bound to negative chloride ions are made of salt (sodium chloride). Water can dissolve salt because the negative chloride ions are attracted by the positive portion of water molecules and the positive sodium ions are attracted by the negative portion of water molecules.
Iodine has a very low solubility in water because it is non-polar. (Any molecule consisting of two identical atoms is non-polar, since the electronegativities of the atoms are equal.) As a result, an I₂ molecule cannot form strong interactions with water molecules (no hydrogen bonds or permanent dipole-dipole interactions), whereas water molecules do form strong interactions with each other. It’s therefore energetically disadvantageous to have iodine molecules mixing with water molecules, since they will get in the way of the water molecules forming maximum interactions with each other. Hence, low solubility.
Hope I answered your question....
Please Mark me brilliant...