Gen Chem II Lab 13: Colligative Properties
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12 Terms
colligative properties
the properties of the solvent that undergo changes due to the addition of solute
molality (m)
moles of solute/ kg of solvent (water)
van Hoff factor (i)
# of particles before dissolving/ # of particles after dissolving
freezing point depression equation (▵Tf) equation
-iKfm = Tf(solvent) - Tf(solution)
for strong electrolytes the van Hoff factor =
the number of ions formed
for non electrolytes the van Hoff factor is
1
how did we find the molality
using the ∆Tf formula; m=∆Tf/iKf
how do we find ∆Tf
setting up a Temp vs time graph of our solvent then of our solution, taking the freezing point before the supercooling curve for each, and subtracting Tf(solvent)-Tf(solution)
how do we find the mass of the acid
from density and the volume (d*mL=g)
how do we find the moles of solute?
from the molality and the mass of the acid [m(m/kg)*kg]
how do we find the molar mass of the solute ?
from the calculated moles and mass of unknown (g/mol)
what is 1 pointing to?