## Chemistry and Chemical Reactivity (9th Edition)

By definition, the freezing point depression is $\Delta T_f=K_f.m.i$ Since these are all aqueous solutions, the ones with the lowest freezing points are the ones with the greater $i.m$ product, and we need to assume complete ionic dissociation, i.e, i is the number of ions per compound: a) $i.m=1\times 0.20m=0.20m$ b) $i.m=3\times 0.12\ m=0.36\ m$ c) $i.m=3\times 0.10\ m=0.30\ m$ d) $i.m=2\times 0.12\ m=0.24\ m$ $a\gt d\gt c\gt b$