Alright, so ionic molality or osmolality represents the molality of dissolved ions within a solution. Now, for example, if we're given 0.30 molar of sodium chloride, sodium chloride dissociates into sodium ion and chloride ion. That's a total of 2 ions involved. If we want the osmolality, that's equal to the number of ions which we said was 2 times the molality of the compound, which is 0.30 molal. This will give us an ionic molality or osmolality of 0.60. So remember, when we're talking about osmolality or ionic molality, we have to take into account the number of ions that dissociate within our given solution. Now that you've seen this, move on to the example left on the bottom of the page and see if your answer matches mine.

This calculation results in an osmolality of 0.60.