Question

Which has the lowest freezing point?

pure water



0.5 M ionic NaCl



0.5 M ionic CaCl2



0.5 M ionic AlCl3



0.5 M molecular C12H22O11

Answer 1

Since they all have the same concentration, the species that produces the most ions will have the lowest freezing point.

Answer 2

Well how would i figure that out

Answer 3

count the number of ions present in the ionic compounds

Answer 4

Where's the ions

Answer 5

they're "hidden" in the compounds, for example:

\(NaCl\rightarrow Na^++Cl^-\)

Answer 6

Alright then!
This is familiar...
Though having the same concentration, it important to notice something- for water, there is hydrogen bond is wuite stronger than the others. As for the rest of the 3, another important thing plays in role : accros the period, the ionic radii decreases, because the atoms lose 1, 2 then 3 electrons, respectively, that is why AlCl3 is the strongest, because the smaller the ion, the greater the attraction,mtherefore NaCl is the weakest and hence, having the smallest freezing point.