Which solution has the largest concentration of ions?

It depends on the solution. For example, a 1M solution of MgCl2 has a greater concentration of ions than a 1M solution of NaCl because MgCl2 breaks apart into 3 ions while NaCl only breaks into 2 ions. On the other hand, a 12M solution of NaCl has a greater concentration of ions than a 1M solution of MgCl2 because the NaCl solution is simply so much more concentrated with NaCl than the MgCl2 solution is with MgCl2.

If the water vapor content stays the same and the temperature drops, then the relative humidity increases. its vise versa.if the water vapor content stats the same and the temperature rises, the relative humidity decreases. so, yes, i'd say that temperature and humidity have a strong relationship.