[firedamage]

Do iodine disslove in water?

[AWK]

Slightly. The solution is pale brown-yellow

[ARGOS++]

Dear firedamage;

Iodine is nearly in “all” Solvents more or less soluble, at least for estimation theirs polarity:

http://www.chemicalforums.com/index.php?topic=30393.msg115551#msg115551

Good Luck!
                    ARGOS⁺⁺

[firedamage]

will there be change of temperature if a seed crystal is added into a supersaturated solution?

[Arkcon]

will there be change of temperature if a seed crystal is added into a supersaturated solution?

Not likely.  Unless, you add a large enough seed crystal, to a supersaturated solution, and the excess crystallizes out.  Then, you may get a rise in temperature or it may drop, depending on the solute.  I don't know what iodine does, but since only a small amount dissolves in water anyway, you may not notice.