Answer 1:
I like your research project. It's not clear
what the letters in your equation mean, though.
The equation I found is: ΔT = i Kf m
OK  it looks like maybe you used the equation
in Wikipedia's article on freezing point
depression. That explains the letters in the
equation.
freezingpointdep
In general, dilute solutions in water are ideal
solutions. Also, if the water gets hotter or
colder when you add the solute, it's not an ideal
solution.
Salt and sugar would be 2 nice solutes to add
to water to measure freezing point depression.
Salt separates into 2 ions in water, Na+ and Cl,
so a mole of salt should depress the freezing
point of water twice as much as a mole of sugar,
which has molecules, not ions.
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