Which of the following is NOT true of colligative properties? Colligative properties are...
A. dependent on the mass of solute present.
B. independent of the chemical identity of the solute.
C. responsible for lowering the vapor pressure of a solution versus the vapor pressure of the pure solvent.
D. dependent on the molar mass of the solute.
E. all of these are true.
i was working on this with two friends, one tried E and the other tried B and they both got the answer wrong. I thought that colligative properties depended on whether a solute was volatile verses nonvolatile and not on if it is ionic or not.
I was thinking D, but I don't have a good reason to justify this answer, since colligative properties depend on the amount in grams of a solute, but not on the molar mass of the solute, and C is true because colligative properties are responsible for lowering the vapor pressure of the pure solvent
The answer is A. Let me legitimitize my answer; Since you can use the freezing point depression equation to find the molar mass of the solute, the molar mass obviously has an effect on the freezing point. I think its pretty clear that C is true. B is true by the definition of a colligative property (colligative properties are dependent on the number of molecules of solute in a solution, not on the identity of the solute) I go to UCI, just did this, and got it right.
its not a...i just did it right now n it said INCORRECT! :(
No you were right. Colligative properties are not dependent on the molar mass of solute, only on the mass of solute. I'm 10000% percent sure. Trust me. Molar mass of solute...the answer is D.
the answer is NOT d!!...i just did it and got it wrong -__-
To determine which statement is NOT true of colligative properties, let's go through each option one by one.
A. Dependent on the mass of solute present.
This statement is true. Colligative properties, such as boiling point elevation and freezing point depression, depend on the number of solute particles present in a solution. The more solute particles there are, the greater the effect on these properties.
B. Independent of the chemical identity of the solute.
This statement is also true. Colligative properties do not depend on the chemical nature of the solute. They only depend on the concentration or amount of solute particles.
C. Responsible for lowering the vapor pressure of a solution compared to the vapor pressure of the pure solvent.
This statement is true as well. Colligative properties, including vapor pressure lowering, occur when solute particles are added to a solvent. This reduces the tendency of the solvent molecules to escape into the vapor phase, resulting in a lower vapor pressure compared to the pure solvent.
D. Dependent on the molar mass of the solute.
This statement is the correct answer. Colligative properties are not dependent on the molar mass of the solute. They depend on the number of solute particles, whether they are ions, molecules, or another form.
E. All of these are true.
Since option D is not true, it eliminates the possibility of option E being the correct answer.
Therefore, the answer is D. Colligative properties are NOT dependent on the molar mass of the solute.