experiment: colligative properties Water cannot be used as the solvent for this

Question

experiment: colligative properties

Water cannot be used as the solvent for this experiment. For what types of molecular substances - give specific examples - could water be used as a suitable solvent to determine a molecular weight?

Can water be used to determine the formula weights of all ionic compounds? What are the limitations, if any?

Why does the slope of the mixed solution continue to decrease rather than reaching a plateau like that observed for the pure liquid? Hint: When the solution freezes the solid is pure solvent.

Explanation / Answer

Water cannot be used as the solvent for this experiment. For what types of molecular substances - give specific examples - could water be used as a suitable solvent to determine a molecular weight?

for colligative properties, try to avoid ionic species, since vant hoff coefficient is not always 1,2,3... etc..

so use only molecualr species such as benzene, alcohol, etc...

Can water be used to determine the formula weights of all ionic compounds? What are the limitations, if any?

Not likely, since NaCl --> i = 2 expected, an many times it could be a valu ebetween 1.5-2.0 so MW will not be accurate

Best to avoid ionic species, use it with molecular species

Why does the slope of the mixed solution continue to decrease rather than reaching a plateau like that observed for the pure liquid? Hint: When the solution freezes the solid is pure solvent.

The slope decreases, since the force ratio is not linear, but exponential

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