Question-Chemistry?

Question

What is the overall charge of an IV solution?

NACL is soluble in water but Iodine is not, why?

Answer 1

4+

There is a list of "rules" that determine whether something is soluble or not, however basically, NaCl will split into Na+ and Cl- ions which will dissolve into water, while Iodine will not dissolve in water

Answer 2

In this case though, it can be explained fairly well.  NaCl consists of ions that separate in water.  When NaCl dissolves, water molecules surround the ions.  Water is a polar molecule, so the molecules surrounding the Na+ ion have the negatively charged oxygen atoms facing it, and those surrounding the Cl- have their hydrogen atoms facing the ion - opposite charges attract.

Iodine, on the other hand, does not split up into ions.  Furthermore, because it consists of 2 of the same atoms, it is perfectly nonpolar, and has no dipole-dipole interactions with the water - the water molecules are attracted more to each other than to the iodine, so they do not dissolve it.  That said, iodine dissolves surprisingly well in water containing dissolved iodide ion (I-) due to the formation of the polar I3- ion.