1) The molecular mass of a substance was determined by the freezing point depression technique. The minimum data required for the determination are
a. ƒ´Tf and Kf only.
b. ƒ´Tf , Kf and mass of solute.
c. ƒ´Tf , Kf , mass of solute and mass of solvent.
d. ƒ´Tf , Kf , mass of solute, mass of solvent and identity of solvent.
e. ƒ´Tf , Kf , mass of solute, mass of solvent and identity of solvent and solute
I know that I already posted this question but my teacher now told us to assume that the solute is not ionic so I was just wondering if this would change the answer to this problem?
Yes, if we can assume the solute is not ionic, then it isn't necessary to know the identity of the solute and solvent.
What's f' stand for?
Its suppose to be deltaT f. So would the minimum data required be Tf, Kf, and mass of solute?
Calculate the mass of solute of glucose per 300 ml which molar mass is 180
Assuming that the solute is not ionic does not change the answer to the problem. The freezing point depression technique is used to determine the molecular mass of a substance based on the lowering of the freezing point of a solvent when a nonvolatile solute is added.
To determine the molecular mass using this technique, the minimum data required are:
a. The freezing point depression (ƒ´Tf) of the solution, which is the difference between the freezing point of the pure solvent and the freezing point of the solution.
b. The molal freezing point depression constant (Kf) of the solvent, which is specific to the solvent being used.
These two pieces of information are sufficient to calculate the molecular mass using the formula:
Molecular mass = (Kf * ƒ´Tf) / molal concentration of the solute.
Therefore, the correct answer to the question remains (a) ƒ´Tf and Kf only. The other options are not necessary for the determination of molecular mass using the freezing point depression technique, although they may be relevant for other aspects of the experiment or additional calculations.