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Given the Kf of water is 1.86° C/m, which of the following aqueous solutions has the lowest freezing point?
a) 0.18 m KCl
b) 0.15 m Na 2SO4
c) 0.12 m Ca(NO3)2
d) pure water
e) 0.20 m C2H6O2 (ethylene glycol)
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