Water is a polar solvent. It dissosiates the solute into ions as soon as it is put in it .
Then why do metals ( e.g. Fe, Al,etc ) do not dissosiates into ions ? If they do why dont they get dissolved completely in water?
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Solution
The solutes which dissociate in water are ionic salts or compounds which are polar also like water. The ionic interactions between the solute ions and polar water molecules leads to dissolution of solute in water. But metals are not polar. They have crystalline structures in which the atoms of a metal are held by strong bonds. So, most metals do not dissociate and dissolve in water.